Scuba Diving Sitemap - Page 1 2016-09-26

Dive Lights/Torches
Such a variety of high-quality dive lights are available that a scuba diver may have a difficult time determining which light will best suit his purposes. Learn about the different types, styles, and uses of dive lights in this section.

Accessories for Scuba Diving
Learn about different accessories and safety equipment used for scuba diving.

Scuba Diving Equipment Recalls
Scuba diving equipment recalls issued by the US Consumer Product Safety Commission (CPSC).

Wetsuits and Drysuits
Water conducts heat away from the body about twenty times more quickly than air. That's why divers can quickly become chilled in even warm waters. Wearing exposure protection in the form of a drysuit or wetsuit can help to keep you warm, safe, and focused.

Scuba Diving Gear - Definitions Reviews and Purchasing Guide for Scuba Diving Gear
Every diver's life depends upon one thing - his scuba diving gear. Learn the basics of dive gear selection and function, and read reviews of scuba diving equipment.

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Why Snorkels Are Important for Scuba: Styles & Features
See photos of snorkels and learn about snorkel features and styles. Snorkels are an important pieces of scuba diving gear. Here are photos and information to help find a snorkel that is appropriate for your needs.

The Fin Pivot Scuba Certification Skill
The Fin Pivot is a skill learned in most scuba certification courses. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

The Fin Pivot - Fin Pivot Scuba Certification Skill Step 2
Release air from the BC to begin the fin pivot, a skill taught in most scuba certification courses. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

The Fin Pivot - The Fin Pivot Scuba Certification Skill Step 3
The starting position for the fin pivot scuba certification skill. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

The Fin Pivot - The Fin Pivot Scuba Certification Skill Step 4
A diver inhales to ascend during the fin pivot scuba certification skill. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

The Fin Pivot - The Fin Pivot Scuba Certification Skill Step 5
A diver inflates her BC to become neutrally buoyant during the fin pivot.

The Fin Pivot - The Fin Pivot Scuba Certification Skill Step 6
A diver inhales to ascend during the fin pivot scuba certification skill. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

The Fin Pivot - The Fin Pivot Scuba Certification Skill Step 6
A diver descends by exhaling during the fin pivot scuba certification skill. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

The Fin Pivot - The Fin Pivot Scuba Certification Skill Step 8
A diver makes the okay sign, having achieved neutral buoyancy during the fin pivot scuba certification skill. Learn about the Fin Pivot and other scuba diving skills and scuba certification courses.

Checking the Time During the Five Point Descent for Scuba Diving - The Five Point Descent for Scuba Diving
Checking the time is the fourth step of the five point descent for scuba diving. Learn how scuba divers should check the time during the five point descent.

Five Steps Divers Use to Descend Properly
The five point descent for scuba diving is: signal, orientation, regulator, time and descend. Here is an illustrated guide to the steps of the five point descent for scuba diving.

Signaling During the Five Point Descent - The Five Point Descent for Scuba Diving
Signaling that a scuba diver is ready to descend is the first step of the five point descent. Learn how to signal properly when using the five point descent for scuba diving.

Orientation During the Five Point Descent for Scuba Diving - The Five Point Descent for Scuba Diving
Orientation is the second step of the five point descent for scuba diving. Learn how a scuba diver can properly orient himself during the five point descent.

Exchanging the Snorkel for the Regulator During the Five Point Descent for Scuba Diving - The Five Point Descent for Scuba Diving
Exchanging the Snorkel for the Regulator is the third step of the five point descent for scuba diving. Learn how a scuba diver should exchange his snorkel for his regulator during the five point descent.

Descending During the Five Point Descent for Scuba Diving - The Five Point Descent for Scuba Diving
Deflating the BCD and descending is the last step of the five point descent for scuba diving. Learn how scuba divers should properly descend during the five point descent.

Completing the Five Point Descent for Scuba Diving - The Five Point Descent for Scuba Diving
After completing the five point descent, scuba divers can safely enjoy a dive. Here are the five steps a dive should use to descend safely.

Proper Trim for Scuba Divers - Why It's Important
Trim refers to a scuba diver's body position. Proper trim is a completely horizontal position, with arms extended and fins elevated. Learn about the value of proper trim, why it is important to both recreational and technical scuba divers.

Tips for Easier and Safer Scuba Diving
Do you find donning your wetsuit difficult? Is your hair always in the way? This list of my favorite scuba diving tricks and tips has been compiled from years of professional scuba diving experience.

The "Bubbles" or "Leak" Hand Signal for Scuba Diving - Underwater Communications
The

20 Common Hand Signals in Scuba Diving
The

The Come Here Hand Signal For Scuba Diving - Underwater Communications
The

The "Level Off" Hand Signal for Scuba Diving - Underwater Communications
The

The "Write It Down" Hand Signal For Scuba Diving - Underwater Communications
The

The "I'm Cold" Hand Signal for Scuba Diving - Underwater Communications
The

The Not Okay or Problem Signal for Scuba Diving - How to Communicate "Problem" Underwater
The

The "Question" Hand Signal for Scuba Diving - Underwater Communications
The question hand signal for scuba diving is made by raising a crooked finger to represent a question mark. This can also indicate confusion, or can be followed by a hand signal such as

The "Up" or "End the Dive" Hand Signal For Scuba Diving - How to Communicate "Up" Underwater.
The

"Direction to Go" Signal for Scuba Diving - Underwater Communications
To indicate a direction of travel, scuba divers use the fingertips of a full hand to point out the direction desired. This helps to avoid confusion with the

The "Low-On-Air" Hand Signal for Scuba Diving - Underwater Communications
The

The "Deco" or Decompression Hand Signal for Scuba Diving - Underwater Communications
There are two ways to make the

The "Stay With Your Buddy" Hand Signal for Scuba Diving - Underwater Communications
The

The Slow Down Hand Signal for Scuba Diving - Underwater Communications
The

Problem and Okay Surface Hand Signals For Scuba Diving - Surface Communications
Divers should be familiar with the surface signals for

The Out-Of-Air Hand Signal For Scuba Diving - Underwater Communications
The

The Safety Stop Hand Signal For Scuba Diving - Underwater Communications
The Safety Stop Hand Signal for scuba diving is made by making the

The "Stop" Hand Signal for Scuba Diving
The

The "Down" Signal for Scuba Diving - Underwater Communications
The

The "Look At" Hand Signal for Scuba Diving - Underwater Communications
The

Is Scuba Diving Safe for Kids? Pros and Cons
Should kids be allowed to scuba dive, and at what age? Read some of the arguments for and against children diving, and add your own opinion.

The Venturi Effect and Scuba Diving - The Dive/Pre-Dive, Off-On, or +/- Adjustment on Your Regulator Second Stage
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

The Venturi Effect and Scuba Diving - The Dive/Pre-Dive, Off-On, or +/- Adjustment on Your Regulator Second Stage
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

The Venturi Switch Effect and Scuba Diving
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

The Venturi Effect and Scuba Diving - The Dive/Pre-Dive, Off-On, or +/- Adjustment on Your Regulator Second Stage
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

The Venturi Effect and Scuba Diving - The Dive/Pre-Dive, Off-On, or +/- Adjustment on Your Regulator Second Stage
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

The Venturi Effect and Scuba Diving - The Dive/Pre-Dive, Off-On, or +/- Adjustment on Your Regulator Second Stage
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

The Venturi Effect and Scuba Diving - The Dive/Pre-Dive, Off-On, or +/- Adjustment on Your Regulator Second Stage
The Dive/Pre-Dive, Off/On, or +/- adjustment on a scuba regulator is a

Where Should an Alternate Air Source Be Attached?
Where should a diver attach his alternate air source regulator? When scuba diving, it is important that the alternate air source regulator be attached in an easily visible location where it may be accessed quickly and efficiently.

Balanced vs Unbalanced, Piston vs Diaphragm
Which is better? An unbalanced or a balanced scuba diving regulator? A piston style first stage or a diaphragm style first stage? The truth is that while all styles have some advantages and disadvantages, they will all work well and safely for recreational scuba diving.

Balanced vs Unbalanced Scuba Diving Regulators
Is balanced scuba diving regulator better than an unbalanced regulator? Will it perform better at depth? Learn about the basics of balanced vs unbalanced regulators.

Marine Ray Identification on Scuba Dives
What are the different types of rays a scuba diver may see on a dive? Learn about the difference between Stingrays, Manta Rays, Electric Rays, and Skate, as well as how to identify them on a dive.

Blood Shift and the Spleen Effect in Freediving
Blood shift and the spleen effect are two aspects of the mammalian dive reflex experienced by freedivers. These responses of the body to pressure increase during a freedive can help to improve a freediver's abilities

Top Freediving Wetsuit Basics to Know Before You Buy
4 tips to help you choose and use a freediving wetsuit, including advice about suit thickness, donning a suit, and more.

Cenote Carwash Photos - Photos of Scuba Diving in Cenote Carwash
See photos of cenote diving at Cenote Carwash. Read descriptions and see photos of cenote diving in various cenotes in Mexico, such as Cenote Carwash. Page 2.

Cenote Angelita Photos - Photos of Scuba Diving in Cenote Angelita
See photos of scuba diving in Cenote Angelita. Cenote Angelita is home to a hydrogen sulfide cloud which creates the illusion of a false floor on this cenote cavern dive. Page 8.

Cenote Esmerelda Photos - Photos of Scuba Diving Near Cenote Esmerelda
See photos of scuba diving in Cenote Esmerelda in Mexico. Read descriptions and see photos of the Mexican Cenotes open to cavern scuba divers. Page 10.

Scuba Diving
See photos of scuba diving in Chac Mool Cenote in Mexico. Read descriptions and see photos of scuba diving in various cenotes, including Chac Mool Cenote. Page 12.

Cenote Corral Photos - Photos of Scuba Diving in Cenote Corral
See photos of cenote diving at Cenote Corral in Mexico. Read descriptions and see photos of cavern diving in Mexico's cenotes, like Cenote Coral. Page 4.

Cenote Dos Ojos Photos - Photos of Scuba Diving at Cenote Dos Ojos
See photos of scuba diving at Cenote Dos Ojos in Mexico. Read descriptions and see photos of diving in various Mexican cenotes, such as Cenote Dos Ojos. Page 9.

Grand Cenote Photos - Photos of Scuba Diving in Grand Cenote
See photos of scuba diving in Grand Cenote in Mexico. Read descriptions and see photos of cavern diving in Mexico's famous cenotes. Page 5.

Photos of Jagged Cenote Formations - Photos Taken of Cenote Formations While Scuba Diving
See photos of jagged cenote formations. Divers can see some cenote formations are caused by the process of dissolution, which leaves jagged, asymmetrical edges. Page 11.

Cenote Kukulkan Photos - Photos of Scuba Diving in Cenote Kukulkan
See photos of scuba diving in Cenote Kukulkan. Read descriptions and see photos of cenote diving in Mexico, including Cenote Kukulkan. Page 6.

Cenote Little Brother Photos - Photos of Cenote Little Brother
See photos taken during a cenote diving at Little Brother Cenote. Little Brother Cenote is usually the entrance for divers touring the Chac Mool Cenote cavern. Page 3.

Cenote Taj Mahal Photos - Photo of Scuba Diving in Cenote Taj Mahal
See photos of cavern diving in Cenote Taj Mahal. See photos and read descriptions of cenote cavern diving in Taj Mahal and other cenotes in Mexico.

Halocline - Photos of the Halocline Taken While Cenote Diving
See photos of the Halocline, or the meeting of fresh and salt water. The Halocline creates and unusual visual effect, and can be seen on cenote cavern or cave divers. Page 7.

Photos of Dives in Mexican Cenote Flooded Caverns
See photos of Mexican cenote diving by Daniel Gut. Scuba diving in the cenote caverns is an incredible experience. Divers in Mexico can see light effects and cave formations when cavern diving, as shown in these photos.

Scuba Diving with Enriched Air Nitrox - Enriched Air Nitrox for Recreational Scuba Diving
Scuba diving with enriched air nitrox is becoming increasing popular with recreational divers. Learn how to become certified to dive with enriched air nitrox, and whether nitrox is right for you.

"Partial Pressure" or "PP" in Scuba Diving
What is the partial pressure of a gas in scuba diving, and how can you calculate it? This is important in diving as the effects of the many gasses change with an increase in partial pressure.

How Scuba Divers' Bodies Absorb Nitrogen
During a dive, a scuba diver's body absorbs nitrogen. Understand the concept of nitrogen absorption when scuba diving using the sponge analogy.

The Buddy System for Safety in Scuba Diving
Why is the buddy system important in scuba diving, and how can recreational scuba divers use the buddy system to stay safe underwater? Here are 8 tips for effectively using the buddy system on every dive. 40% of diving fatalities occurred during periods of buddy separation.

Bad Air - Safety Information in Scuba Diving
Yesterday, I made my triumphant return to diving after a serious ankle injury - almost triumphant. Since nearly two months had passed since I last used my

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Emergency Decompression Guidelines for Scuba Diving
Guidelines for emergency decompression state that a scuba diver should remain at 15 ft for 8-15 min, depending on how far he exceed his no-decompression limit.

Scuba Diving Lessons, Certification, Gear and Travel
Scuba diving facts and articles written by a full-time instructor. Learn about lessons, certification, dive theory, gear, and dive travel.

The Challenges of Stage Cave Diving
Carrying a stage cylinder on a cave dive is easy. Dealing with emergencies when using a stage is not, which is why a stage course is recommendable. One interesting topic we teach in our stage courses is the psychological and physical aspects of stage cave diving, here's a peek!

Is It Safe to Dive on Decongestant Medication?
Can you scuba dive with decongestants? It may be safe to scuba dive with decongestants, but there are several points a diver should take under consideration before deciding whether or not to use medication underwater.

What Is Nitrogen Narcosis and How Does It Feel?
Nitrogen narcosis affects most scuba divers at depths below 100 feet and can be dangerous. Learn about its causes, symptoms, and treatment.

Scuba Diving Risks - Pressure, Depth and Consequences
The increase in water pressure with depth affects almost all aspects of scuba diving, including equalization, buoyancy, and bottom times.

What Is the Maximum Safe Ascent Rate for Scuba Diving?
What is the maximum safe ascent rate for scuba diving? Some diving organizations list the maximum safe ascent rate as 30 feet per a minute, while others list it as 60 feet per a minute. What is the safest ascent rate?

What Is a No-Decompression Limit in Scuba Diving?
A no-decompression limit (NDL) is a time limit for a scuba dive, based on depth and previous dive profiles.

Start Scuba Diving - Step by Step Guide
Are you ready to start scuba diving? Here is a step by step guide to learning to dive, including medical requirements, courses, certification agencies, basic dive theory and frequently asked questions.

Piston vs Diaphragm Regulator First Stages (Scuba Diving)
What is the difference between a diaphragm and a piston regulator first stage, and which is better? Both are very good, but there are some differences to consider when choosing a scuba diving regulator.

5 Ways to Keep Your Hair Out of Your Face When Scuba Diving
Long hair can be very annoying when scuba diving. It floats in front of your face and your mask, and shifts around, altering the position of your mask strap. Here are my tips for securing long hair when scuba diving.

Long Hair, Hairstyles, Ponytails, and Scuba Diving
Long hair can be very annoying when scuba diving. A ponytail will work in a pinch, but it is not the best method of tying back hair when scuba diving. Here are my tips for securing long hair when scuba diving.

Long Hair, Hairstyles, French Braids, and Scuba Diving
Long hair can be very annoying when scuba diving. A French braid works well o keep a diver's hair out of her face. Here are my tips for securing long hair when scuba diving.

Long Hair, Hairstyles, and Scuba Diving
Long hair can be very annoying when scuba diving. It floats in front of your face and your mask, and shifts around, altering the position of your mask strap. Here are my tips for securing long hair when scuba diving.

Long Hair, Head Scarves, and Scuba Diving
Long hair can be very annoying when scuba diving. Some divers use head scarves to hold their hair back, but scarves tend to slip off. Here are my tips for securing long hair when scuba diving.

Long Hair, Hoods, and Scuba Diving
Long hair can be very annoying when scuba diving. It floats in front of your face and your mask, and shifts around, altering the position of your mask strap. Here are my tips for securing long hair when scuba diving.

Risk of Scuba Diving: Pulmonary Barotrauma
Every scuba diver is at risk of a pulmonary barotrauma if he holds his breath underwater and ascends. Additional conditions and actions can cause a pulmonary barotrauma when scuba diving.

What Is Boyle's Law? How Does It Apply to Scuba Diving?
Boyle's Law, PV=c, is useful in scuba diving because Boyle's Law helps scuba divers predict how air will expand and compress with water pressure. Read an explanation of Boyle's Law and how it applies to scuba diving.

Poor Eyesight and Scuba - Diving with Corrective Lenses
Can people with poor eyesight scuba dive? Absolutely! Divers may use prescription masks, soft contact lenses, stick-in bifocals, and even laser eye surgery to ensure clear vision underwater.

Drysuit Care and Maintainence: Quick Checklists for Divers
How you care for your drysuit is just as important as the drysuit you buy. Keep your drysuit in good condition with these simple tips and procedures.

Wreck Diving
All about the mysterious and exhilarating world of wreck diving. News, sites, and diving techniques.

How Wrecks Help the Reefs and Reefs Help the Wrecks
Wrecks attract coral and fish to areas with little aquatic life. The process of colonization is often study by marine biologists to learn about reef formation and recovery, and the creatures on the wreck may actually help to preserve it.

Medical Considerations for Scuba Diving
Can you dive with asthma? How about breast implants? Which medical conditions prevent someone from diving, and which don't matter at all?

Nausea, Acid Reflux, and Scuba Diving
Have you ever experienced heartburn or felt nauseated during a dive? If you have, you are not alone. Recently, I received a question about nausea, heartburn and

Can You Scuba Dive With Breast Implants?
Can you scuba dive with breast implants? Yes, after an appropriate recovery time, scuba diving after a breast augmentation surgery is safe. How do breast implants affect buoyancy? Do breast implants compress underwater?

Ear Barotraumas (Causes, Identification, Treatment)
Ear barotraumas are the most common injuries experienced by recreational scuba divers. Learn how to recognize, avoid and treat scuba diving ear barotraumas.

Buoyancy in Salt Water vs Fresh Water for Scuba Diving
Scuba diving concepts: How does an object's buoyancy change from fresh water to salt water? An object is more buoyant in freshwater vs saltwater because . . .

What Do You Wear Under Your Wetsuit?
What do you wear under your wetsuit when scuba diving? Here are 10 options, from rash guards to pantyhose.

What Is the Difference Between DIN and Yoke Regulators?
What is the difference between DIN and Yoke scuba regulators? The difference between a DIN and a Yoke regulator is the way it attaches to a scuba tank.

Boat Diving Etiquette for Scuba Divers - Tips for Being on Your Best Behavior During Your Scuba Trip
How can you be on your best behavior during your scuba diving trip. Here are guidelines and tips on proper boat etiquette to be sure that you avoid alienating everyone on board.

6 Tips for Transitioning to Cold Water Diving
Cold water diving is as comfortable and enjoyable as warm water diving when the correct equipment and procedures are used. Here are 6 tips to help scuba divers transition to cold water diving.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Whale Shark Facts - Information About Swimming Snorkeling and Scuba Diving With the Biggest Fish
Whale Shark facts for scuba divers and snorkelers. Whale sharks are the biggest fish in the sea, but they pose no threat to humans. Whale sharks are gentle filter feeders and are found in most tropical oceans. See whale shark photographs and learn more about swimming with whale sharks.

Can You Eat and Drink Underwater While Scuba Diving?
Can you eat and drink underwater while scuba diving? Yes, scuba divers can consume food and fluids underwater. Here is information and facts about what to eat and drink underwater, and how to do it.

Tipping Guidelines for Scuba Divers
Tipping is so confusing. Who should divers tip after dive, and how much is appropriate? Here are some tipping guidelines for scuba divers.

What Can You Do With a Decommissioned Scuba Tank
What can you do with a decommissioned scuba diving tank? Once a tank fails hydro, what can you do with it? Read tips from other divers and share your own.

Recreational, Technical and Professional Scuba Diver Training
A guide to scuba training, including open water certification, advanced diving, technical diving, and professional instructor and divemaster courses.

Should Snorkels be Required Scuba Diving Gear?
Should snorkels be required scuba diving gear? Read other divers opinions and leave your own here.

10 Best Scuba Diving Masks
What scuba diving mask should you buy? Here is a list of 10 the 10 best scuba diving masks according to About.com Scuba.

Stoplight Parrotfish Poop Sand (And Other Interesting Facts for Divers)
The Stoplight Parrotfish, Sparisoma viride, is a fascinating and common Carribean fish. Stoplight Parrotfish change both gender and color, have beaks, and poop sand.

Save a Dive Kits for Scuba Diving
What should a diver carry in his

Why Does Scuba Diving Make You Need to Pee?
Scuba divers commonly feel the need to pee in their wetsuits. This is a normal reaction to the underwater environment. Cold water immersion diaresis and the weightlessness of being underwater combine to increase a diver's urine production.

Open Water Skill: Regulator Clearing
How to perform the open water skill - Regulator Clearing - also known as Regulator Removal and Replacement.

Freediving - World Records, Information, Training, Certification Agencies, and Gear
Freediving reference page. Information and facts about freediving training, world records, certification agencies, and gear such as fins and masks.

Freediving - World Records, Information, Training, Certification Agencies, and Gear
Freediving reference page. Information and facts about freediving training, world records, certification agencies, and gear such as fins and masks.

Scuba 101 - Learn to Scuba Dive
Information for beginners about the basics of scuba diving and learning to scuba dive - all about what scuba diving is and what scuba divers do and how you can learn to dive.

Types of Scuba Diving
Learn about all the different types of scuba diving – recreational, technical, commercial, and military.

Books, Movies, and TV Show About Scuba Diving
Here's the place to find reviews of all the latest books, movies, magazines, and television shows about scuba diving.

Aquatic Life- A World of Strange and Wonderful Aquatic Life
Learn about all types of aquatic life - fish, mammals, coral, and all of the other creatures found in both fresh and salt water - what they are, what they look like, how to identify them, and how to interact with them.

Basic Scuba Diving Equipment Glossary
I've put together a guide to all the basic equipment you're likely to encounter when you start diving.

Scuba Diving Equipment Reviews
Your guide reviews all the best equipment available.

Scuba Diving Masks- Facts and Tips for Scuba Diving Masks
Scuba diving masks- Learn facts and hints about how to try on, prepare and use scuba diving masks.

Buoyancy Compensators - Buoyancy Compensators for Scuba Diving
A buoyancy compensator (also known as a buoyancy control device, BCD, or BC) has two basic functions in scuba diving. It allows a diver to control his buoyancy, and therefore his depth, during a dive, and it attaches the tank to the diver. Learn more about buoyancy compensators here.

Dive Theory - Important Dive Theory for Every Scuba Diver
What information do scuba divers need in order to dive safely? Here is an overview of basic dive theory that will help divers to understand and safely explore the underwater world.

Dive Medicine & Safety
A complete overview of dive medicine and safety. Lots of information about diving and boating safety, injuries and illnesses, safety equipment, CPR and first aid, and dive insurance.

Learn to Dive
Interested in learning to dive? This is the place to find out all of your options from one day try diving programs to full open water certification courses.

Scuba Diving Jobs - Scuba Instructor, Divemaster and More
Do you want to be the one leading the dive? Learn about scuba diving jobs including working as a scuba instructor, divemaster, commerical diver, and more.

Types of Diving
There are all sorts of scuba diving specialties for all sorts of people. This is the place to read about all of the different types of specialty course you can take and all the exciting dive opportunities on offer.

Regulators - Scuba Diving Regulators
Scuba diving regulators reduce the high pressure air in a scuba tank to a pressure than a diver can safely breathe. Learn more about scuba diving regulators here.

Courses and Training
It's easy to start scuba diving, and it's even easier to stay interested. Once you have finished your basic dive training and become a certified diver, there's a lifetime of experiences awaiting, all you have to do is pick your next adventure!

Freediving - Learn to Free Dive
Freediving is becoming an increasingly popular sport. Learn the basics of freediving including courses, certification and liscenses, gear and more.

Disabilities and Diving
Many different strategies exist to adapt diving to meet the needs of divers with a variety of disabilites.

Rebreathers
Rebreathers recycle a diver's exhaled gas instead of releasing it to the environment. This reduces the volume of gas needed in comparison to open circuit diving, and has several advantages in both technical and recreational diving.

Getting Started With Stage Decompression Diving
What is stage decompression diving, what training courses are offered, and what are the prerequisites? Get started with stage decompression diving!

Normoxic Trimix Diving
Normoxic trimix training allows divers to use trimix to dive within the depth limitations of air. The advantages include a clearer head and reduced work of breathing.

21 Rebreather Components That Every CCR Diver Should Understand
Understanding the functionality of rebreather equipment components is essential for all CCR divers, and it helps to debunk a bit of the mistique surrounding the devices for those of us who haven't made the leap to rebreather diving. Rebreathers are a little complicated, but not impossible to understand.

The International Association for Handicapped Divers - Scuba Training
The International Association for Handicapped Divers (IAHD) specializes in training instructors to work with and train scuba divers with a variety of disabilities.

Intro to Tech Diving Course - Technical Scuba Diving
The Intro to Tech Course (2-3 days) introduces divers to technical diving gear and covers advanced buoyancy, trim and propulsion techniques.

Is Diving Bad for the Environment?
A reader recently emailed me a link to an article about scuba diving and the environment called

Adjusting Trim Using Equipment Choice and Configuration
Adjust and select scuba diving gear to achieve proper trim (horizontal position in the water) using these seven tips. A diver's trim is affected by his weight distribution, wetsuit, fins, regulators, tank position and more.

Scuba Diving Conservation Vacations and Internship Opportunities
Suggested scuba diving conservation vacations and interships. Marine conservation vacations are a great way for scuba divers to enjoy exotic diving and help to preserve the underwater world.

Coral Reef Restoration - Opportunities for Scuba Divers
Coral Reef Restoration opportunities for scuba divers help scuba divers to preserve and save the undewater world they love.

Glossary of Rebreather Diving Terms
This glossary of basic rebreather diving terminology will help readers to understand the technical terms used in rebreather diving.

7 Tips for Putting a Wetsuit on More Easily
Do you have trouble getting into your tight-fitting wetsuit? Here are seven tricks to putting on a wetsuit more easily.

Technical Diving
Learn about Technical Diving with Guest Author Vincent-Rouquette Cathala. Articles cover topics including types of technical diving, technical diving gear, and courses.

Scuba Diving FAQs
Scuba Diving FAQs

Scuba Diving Terminology
All the most common terminology explained. Some scuba diving terminology is not always clear to those new to the sport. This is the place to learn what all those strange words mean.

What is Scuba Diving? - Everything You Need to Know
Find out what scuba diving is, why you should dive, what types of diving there are, and all the basics about scuba diving.

Enriched Air Nitrox - Recreational Scuba Diving With Enriched Air Nitrox
Scuba diving with enriched air nitrox is becoming increasingly popular with recreational scuba divers because of its many benefits. Learn how to dive with enriched air nitrox safely, and how to become a certified enriched air nitrox diver.

Training Updates and New Programs
Keep updated with information about new PADI program and training/standards updates.

Side Mount Diving
Side mount is an equipment configuration in which the diver wears his tanks on his sides, tucked right behind his armpits. The configuration is becoming increasingly popular with good reason: it's fun!

Recreational Diver Specialties
Once you are a certified diver, there are numerous directions to take your diving; deep diving, wreck diving, nitrox diving, and even underwater photography are all great ways to advance you diving and explore more of the underwater world.

Commercial Scuba Diving
Thinking of becoming a commercial diver? Here's all the information you need.

Deep Diving
Learn about the exciting world of deep diving.

Scuba Diving Movies
Movies either all about, or featuring scuba diving.

Night Diving
Experience a completely different underwater world once the sun goes down. Learn about the exciting specialty of night diving.

Underwater Photography & Videography
Learn everything you need to know about underwater photography and videography. From the basics all the way through to advanced techniques and information all about equipment.

Scuba Diving Skills
Step by Step guides to scuba diving skills. Learn how to perform skills with these step by step guides featuring photos and videos.

Open Water Certification Course - Information for Student Scuba Divers on the Open Water Certification Course
Interested in becoming a certified scuba diver? Before enrolling in an open water scuba certification course, learn about certification options, requirements, and agencies and determine if the open water course is right for you!

Rebreather Terminology
A clear understanding of rebreather diving requires a basic grasp of rebreather terminology. Here are some of the most common rebreather terms and definitions.

Training Organziations for Disabled Divers
Learn about different training organizations that cater to scuba divers with a variety of disablities.

Freediving Basics
What is freediving? How is it different from scuba diving, and what basic information do you need to get started?

Improve Your Freediving
Freediving instructor Julien Borde discusses training and techniques to improve your freediving.

The Science of Freediving
How does a freediver manage to hold his breath for so long? Learn about the physiology and science of freediving.

Fish
Profiles of the fish most commonly sited by scuba divers.

Fish Identification
Articles and links to help you identify everything you see when diving.

Other Creatures
Learn all about all of the other creatures in the sea. If it's not a fish, mammal, or coral you'll find it here.

Sharks
This is the place to find out everything you want to know about sharks - the most amazing fish in the sea!

The Most Important Safety Guildines
It's easy to stay safe in scuba diving -- just know the basic safety guidelines and make sure you follow them on every dive. This section covers some of the most important ones!

Safety Gear for Scuba Diving
What scuba diving safety gear should you carry? A surface marker buoy, dive light or dive knife may be essential, depending upon where you dive.

Aquatic Life- Aquatic Life to Aviod
Aquatic life to avoid. Some aquatic life an harm divers. Find out which animals divers should avoid.

Scuba Instructor
Working as a professional scuba instructor is rewarding and fun. Learn about how to turn your dream of working in diving into a reality.

Cave and Cavern Diving
Cave and cavern diving are scuba diving specialities requiring highly specialized training in order to dive into flooded cave systems.

Divemaster
A divemaster is qualified to supervise and guide certified divers, assist instructors, and conduct certain scuba programs independently. The PADI Divemaster is level of PADI's professional certifications, and is a prerequisite to becoming a scuba instructor.

Freediving Gear
Freediving does not require much gear, but there are a few essentials that every freediver should consider purchasing. Learn about freediving fins, wetsuits, and more.

Freediving Training Associations
Are you ready to get started freediving? The first step is to choose a freediving training association.

Planning and Executing Safe Freedives
Learn about considerations for planning and making safe freedives. There is a lot more to safe dive planning than one might think!

Vacations and Destinations for Freedivers
While you can freediving in a local swimming pool, it might not be the most exciting dive site in the world. Learn about popular freediving destinations and plan your next trip!

Solo Diving
Solo diving can be enjoyable and safe, and enrolling in a solo diving course can make a diver safer and more self-sufficient, even if he never plans to dive on his own.

Speciality Courses for Instructors
Speciality Courses allow instructors to teach a broad range of topics to their students; from deep diving to conservation topics.

Scuba Diving Theory - Learn Basic Theory for Every Scuba Diver
Every scuba diver needs to master basic dive theory. Here is an overview of important concepts such as ear equalization, nitrogen absorption, pressure effects, and buoyancy that all scuba divers (and student divers) should know.

Technical Scuba Diving
Technical diving (tec diving) is a type of scuba diving that enables divers to exceed recreational diving limits of time, depth, and penetation. This is accomplished through the use of specialized gear, breathing gas mixtures and dive profiles.

Conservation and Ecology for Scuba Divers
Learn about conservation and ecology for scuba divers. Here are quick tips and reads to help scuba divers protect the underwater world they love.

Snorkeling Basics - Equipment, Techniques, Travel and Vacations
Snorkeling is an easy and fun way to explore the underwater world. Learn about snorkeling basics, equipment, techniques, and destinations here.

Scuba Diving Editorials
Editorials and opinion pieces by About.com Guide to Scuba Natalie L Gibb. Read editorials about scuba diving safety, habits and more (and sometimes the occasional dive instructor rant.

Cave and Cavern Diving - Training and Information
Cave diving is a technical form of diving requiring demanding training. Why cave dive? The great beauty of flooded cave systems and the chance to see part of the world that few humans experience draws more and more divers to the sport each year.

Guest Authors
Read biographies of About.com Scuba's guest authors, and learn about their experiences in scuba diving. This section also allows readers to browse articles by author.

Certification / Open Water Courses
This is the place to find all sorts of information about Open Water certification courses. I give you a complete overview of the course and the skills you’ll learn and compare the different Open Water courses available.

Handicapped Scuba Association (HSA)
The Handicapped Scuba Association (HSA) was the first organization to tailor scuba courses to divers with disabilites. It is now an international organization.

Should You Scuba Dive Solo?
In a sport that relies on the buddy system at nearly every level of training, solo diving is often frowned upon. Can solo diving ever be completely safe, or is it just downright irresponsible?

5 Hazards of Solo Diving and How to Avoid Them
Solo diving can be dangerous. Fortunately by sticking to five simple guidelines, a solo diver can enjoy diving safely and responsibly.

Torben Lonne - Solo Diving
Torben Lonne is a guest author for solo diving for About.com Scuba Diving. He is the chief editor of DIVE.in magazine and an experienced dive instructor.

The Advanced Nitrox Course
The Advanced Nitrox Course is a technical diving course that trains divers to extend their no-decompression limits by using a variety of nitrox blends and oxygen.

What Is Trimix - Technical Scuba Diving
What is Trimix? Trimix is a blend of oxygen, helium, and nitrogen used by technical scuba divers to safely dive beyond recreational dive limits.

Vincent Rouquette-Cathala - Technical Diving in Mexico
Technical Scuba Diving and Cave Instructor in Mexico - Vincent-Rouquette Cathala of Phocea Dive Center in Playa del Carmen.

Pros and Cons of Side Mount in Cave Diving
What are the advantages of side mount for cave diving? Some of the advantages of side mount include greater stability, versatility and self-redundancy.

Illustrated Guide to Scuba Regulator Mouthpieces
Scuba diving mouthpieces come in a variety of styles. See an illustrated list of common types of scuba diving regulator mouthpieces.

International Association for Handicapped Divers (IAHD) Dive Centers
A list of dive centers offering adpative scuba diver training through the International Association for Handicapped Divers (IAHD). If you are a IAHD dive center, or your dive center is a member of a different adaptive dive training organization, contact us!

"The Current" A Documentary About Diving With Disabilities


Freediving Training Schools and Associations
Read a list of recognized, reputable freediving schools, including AIDA, FII, SSI and others. This list of freediving associations include links to some of the most common agencies.

Omer Zero Cubed Diving Mask - Scuba Gear Reviews
The Omer Zero Cubed diving mask works well for freediving and may also be used for scuba diving. This diving mask has an exceptionally low internal volume and a wide field of vision. Read a full review of the Omer Zero Cubed Mask here.

Can You Scuba Dive on Your Period?
Can you scuba diving on your period? Here considerations for menstruating scuba divers, including the liklihood of shark attacks, the risk of decompression sickness, and the use of tampons.

Learn Buoyancy Basics for Scuba Divers
An understanding of buoyancy is key to safe and easy scuba diving. While the concept of buoyancy may be confusing at first, it becomes clearer when we consider how buoyancy effects scuba divers and what divers need to know to properly control their buoyancy on a dive.

8 Ways to Prevent a Scuba Diving Mask From Fogging
Prevent scuba diving masks from fogging. New and used scuba diving masks and snorkeling masks must be treated in different ways to prevent them from fogging.

Review of Drysuit Seals and Accessories
Review of drysuits seals and accessories. Most drysuit manufacturers offer divers their choice of pockets, relief valves, and seal type.

Drysuit Review
Review common drysuits and their features before you choose a brand or model. There are more options available than you might think!

Adaptive Diver Profile: Cody Unser
Adpative scuba diving is a growing sport. Cody Unser has advocated for medical studies which suggest that adpative diving may provide relief for divers with disabilities.

Wreck Diver Training and the Different Types of Courses
The three main types of wreck diving are no-penetration, limited penetration, and full penetration. The different types of wreck diving require different levels of training.

Cave Diving Isn't a Crazy as It Sounds
What is cave diving and why would anyone ever want to swim into a dark hole in the ground? Here is a very basic article for people with no previous knowledge of the sport.

What Is the Rule of Thirds in Scuba Diving?
The rule of thirds states that a scuba diver may use up to one third of his tank to reach the furthest point in his dive, one third to return to his starting location, and one third as a reserve.

The Mammalian Diving Reflex and Freediving
The mammalian diving reflex is a natural adpative reflex which allows marine mammals, diving birds, and people to stay underwater for long periods of time.

Scuba Diving Buoyancy Control Advice
Hints and tips to improve your buoyancy control. Good buoyancy control is one of the most difficult skills to master in scuba diving, but also one of the most important.

Underwater Photography
Underwater photography is probably one of the most popular (and challenging) hobbies of scuba divers. Learning to master the basics of photography on land is already difficult enough, doing so while maintaining buoyancy and trim can take a lifetime to master.

How to Wash Your Scuba Gear
Quality dive gear will last for years, but only if you maintain it carefully. Washing you gear after every dive is important, because salt, sand, and other substances can quickly damage dive gear.

The Martini Effect in Scuba Diving
The Martini Effect or the Martini Rule for scuba diving refers to nitrogen narcosis, a physical and mental impairment comparable to being drunk.

Every Dive Is a Decompression Dive
Every scuba dive involves the compression and decompression of nitrogen in a diver's body, and can be viewed on some level as a decompression dive.

How to Keep Diving During the Winter
If you live in a cold climate and don't want to go ice diving, you still have a few options to keep your dive skills fresh during the winter.

Preventing Blisters on Feet and Ankles When Scuba Diving
Sometimes dive booties and fins can rub raws spots or blisters on a scuba diver's feet and ankles. Here is one tip for preventing blisters when scuba diving.

Signs of a Bad Dive Shop
Last week I taught part of a scuba course for a local dive shop as a free lance instructor. I was thoroughly surprised by what I saw. By the end of the day, I

PADI's Discover Scuba Diving Course Takes One Day
Most healthy adults can try scuba diving with a one-day scuba course. While you won't earn a certification in one day, these courses are a great way to discover if you like diving, or to see a specific underwater attraction.

- By Category
An index of categories in the

Are Sea Urchin Spines Venomous? Yup! And It's a Pretty Cool Defense
Sea urchins are venomous, and spines are not their only method of defense. These stinging creatures are everywhere, and avoiding them is not always as easy at it sounds.

When Is Nitrox Dangerous? 7 Risks of Diving With Nitrox
Divers who use enriched air nitrox must manage the risk of oxygen toxicity and explosion. While nitrox is a great tool, the dive planning is more complex and fills can be pricey.

Can I Snorkel? What's the Difference Between Snorkeling and Scuba Diving?
What is snorkeling? Learn basic information for novice snorkelers, including the difference between scuba diving and snorkeling.

How to Clean Dive Slates and Underwater Notebooks
Slates and underwater notebooks are useful writing utensils for scuba diving, but how can you get them clean after use? Don't use soap or pencil erasers! Instead try this tip!

Are Jellyfish Dangerous to Scuba Divers?
Jellyfish are more likely to sting swimmers and snorkelers than scuba divers because most species stay relatively close to the surface. However, divers do occasionally experience jellyfish stings.

Can I Scuba Dive? Prerequisites for Scuba Diving Such as Age and Health
Can I scuba dive? Learn about the prerequisites for scuba diving such as age, health, and swimming abilities and decide if you are able to scuba dive.

What Is the Definition of a Squeeze in Scuba Diving?
A squeeze occurs in scuba diving when the pressure of the water surrounding a diver is greater than the pressure inside his or her body air spaces.

Why Are Some Divers So Obsessed With Wreck Diving?
If you feel that it's time to add a new dimension to your diving, to try something a bit more challenging, and wreck diving might be just what you are looking for. Here's some reasons that wreck diving is so addicting.

Jo Edney, Guest Author for About.com Scuba
Joanne Edney is a guest author for About.com Scuba, and a underwater researcher and PhD student, and dive instructor. Her research focuses on wreck diving.

Why You Should Start Using a Dive Light on Every Dive
Scuba diving lights are becoming cheap, reliable, and small. There really is no reason not to carry one on every dive. Learning to use a dive light properly can increase diver's safety and enjoyment underwater.

What Is a Drysuit? How Do Drysuits Work?
Are you too cold on scuba dives? Consider a drysuit! A drysuit is a waterproof suit that traps a layer of air against the diver, helping the diver to stay warm and comfortable in cooler waters.

How Does a Wetsuit Keep a Scuba Diver Warm Underwater?
A wetsuit helps to keep a scuba diver warm underwater by trapping a thin layer of water inside the wetsuit, which his body heats up.

Long Hose vs Short Hose Regulator Configuration
What is the difference between a long hose and a short hose scuba diving regulator. Read about the pros and cons of a long hose vs a short hose regulator for recreational and technical scuba diving.

6 Things You Need To Know About Scuba Masks
Scuba masks are one of the most important pieces of scuba diving gear. Here are six important things to know about scuba masks.

Decompression Sickness vs Nitrogen Narcosis
In scuba diving, nitrogen narcosis and decompression sickness are both caused by nitrogen. However, the two conditions have very different symptoms and treatments.

How Does Fire Coral Look? How Should I Treat a Sting?
What is fire coral and what does it look like? This quick visual guide to fire coral and sting treatment will help you to avoid it before you learn about fire coral the hard way.

Identify Fire Coral - Fire Coral Has White Tips
Learn to identify fire coral. Most fire coral has white tips.

Fire Coral Identification - Fire Coral Has Visible Stingers
Learn to identify fire coral. Most fire coral has visible stingers.

Avoid Fire Coral Stings - Wetsuits Help Prevent Fire Coral Stings
Wetsuits can help to avoid fire coral stings. Having the proper exposure protection can prevent fire coral stings.

Fire Coral Stings - Learn to Identify Fire Coral Stings
Learn to identify fire coral stings. Divers must learn to identify fire coral stings to properly treat them.

First Aide for Fire Coral Injuries
Learn to treat fire coral images. First aid for fire coral images.

The Advanced Open Water Course
The advanced scuba diver course is a second level certification aimed to introduce divers to new environments and skills. The courses differ with agency.

What Are the Benefits of Scuba Diving With Nitrox?
What are five benefits to scuba diving with nitrox? Why is the use of nitrox in recreational diving becoming more and more popular?

The Dive That Launched a Career
In retrospect, my first scuba dive wasn't anything special. But that first half hour underwater changed my life and launched my diving career.

Vest-Style vs Back Inflation BCDs: Pros and Cons
Should you purchase a back inflation or a vest style BCD for scuba diving? I prefer back inflation, but there are pros and cons to each style.

Maximum Operating Depth (MOD) Calculation for Scuba Diving
A Maximum Operating Depth (MOD) is a depth limit based on the percentage of oxygen in a scuba diver's tank. Here's the MOD forumal and a cheat sheet for MODs of common breathing gasses.

How Long Does a Scuba Tank Last
An average scuba diver can stay underwater for 45 to 60 minutes on a 40-foot dive. Many factors affect tank duration, including depth, tank volume, and the diver's air consumption rate.

7 Things You Can Do Now to Prepare for Technical Diving
Learning a technical mindset takes a little work, but luckily you don't need to go on technical dives to dive like a tec diver!

Solo Diving Skills: Out of Gas Solutions
What do you do if you run out of breathing gas on a solo dive. Guest author Torben Lonne outlines the four solutions to an out-of-gas scenario while solo diving.

Pro and Cons of Side Mount for Ocean Diving
Should you side mount as an open water diver? There is no easy answer. Side mounting in the ocean has both advantages and disadvantages, and ultimately it's up to you to weight the pros and cons and make your decision.

What Is Open Water In Scuba Diving?
What does open water mean in scuba diving? In scuba diving, open water is usually defined by as being less than 130 feet deep and not in an overhead environment.

12 Diving Concepts You've Never Learned or Already Forgotten
Review basic concepts essential to safe and easy scuba diving. Here is a list of important dive theory that all scuba divers need to know.

What Is Confined Water in Scuba Diving?
In scuba diving, the term

3 Basic Pieces of Gear Every Diver Should Own
The first three pieces of dive gear you should buy are a mask, fins, and snorkel. Having just these items will make your dives infinitely more comfortable.

6 Reasons to Love Diving
The moment I deflate my BCD and slip below the surface, the physics of my environment changes. I am in free fall. I am in control. I love to stretch my arms out and swoop down to the reef like a bird.

What Does EANx Stand for in Scuba Diving?
In scuba diving, EANx stands for Enriched Air Nitrox. EANx is a mixture of oxygen and nitrogen, with an oxygen percentage great than 21%.

What Does EAN Stand for in Scuba Diving?
What does EAN stand for in scuba diving? Recreational scuba divers use the abbreviation EAN to mean enriched air nitrox, which has many benefits for scuba divers.

The Pit: One of Mexico's Best Cenote Dives
The Pit is one of Mexico's best cenote dives. Conditions are good year-round, but the best light effects occur between May and October on days with strong sun.

Why It's Unsafe to Turn Your Tank Valves 1/4 Rotation Back
Are you still turning your your tank valves 1/4 turn back before diving? This practice could be dangerous! Here is information about this antiquated technique.

How Bad Is a Bearded Fireworm Sting?
A bearded fireworm sting really hurts. Fireworms are found in tropical atlantic waters. Stings are treated by removing the spine and treating the affected area.

How to Clear a Scuba Mask of Water
A scuba diver signals that she is ready to begin the open water mask clearing skill. Mask clearing is an important open water skill.

A Scuba Diver Relaxes and Prepares to Clear Her Mask of Water - Mask Clearing Skill
A scuba diver relaxes and visualizes clearing her mask of water. Mask clearing is an important open water scuba diving skill.

A Scuba Diver Lets Water Enter Her Scuba Mask - Scuba Mask Clearing Skill
A scuba diver allows water to enter her scuba mask in a controlled manner. Mask clearing is an important open water scuba certification skill.

A Scuba Diver Breathes With a Partially Flooded Mask - Mask Clearing Skill
A scuba diver breathes through her mouth while her mask is partially flooded. Mask clearing is an important open water scuba certification skill.

A Scuba Diver Breathes Out Her Nose to Empty Water From a Scuba Mask - Mask Clearing Skill
A scuba diver holds her mask, tilts her head back, and breathes out her nose to clear water from her scuba mask. Mask Clearing is an important open water scuba certification skill.

A Scuba Diver Exhales to Clear Remaining Water From Her Diving Mask - Mask Clearing Skill
A scuba diver repeats the exhalation step of the mask clearing skill to remove any remaining water from the mask. Mask clearing is an important open water scuba certification skill.

A Scuba Diver Has Successfully Cleared Water From Her Diving Mask - Mask Clearing Skill
A scuba diver signals that she is

Are Pufferfish Poisonous?
Pufferfish are the second most poisonous vertebrate on the planet, but they are not venomous. Ingesting tetrodotoxin, or pufferfish poison, can lead to respiratory failure.

How Do Pufferfish Inflate?
Pufferfish can inflate to over three times their normal size when threatened. What makes this possible?

5 Surface Signaling Devices That Could Save Your Life - Scuba Diving
Locating a lost scuba diver on the surface is difficult, but surface signalling devices can help. Here are 5 devices to consider carrying with you on every dive.

Surface Marker Buoys - Buy One and Learn to Use It
A surface marker buoy is an inflatable tube used indicate a scuba diver's position or increase his visibility on the surface. I believe every diver should carry a surface marker buoy. Here's why . . . .

How to Use a Surface Marker Buoy
Surface marker buoy (SMB) use is one of the most under-practiced, important skills a diver can master. It was added to the PADI Open Water Course curriculum in 2015 for good reason: a properly deployed SMB can be a lifesaver.

My First Solo Dive After Certification
Torben Lonne tells the story of his first solo dive, and how learning to solo dive changed is dive career for the better.

5 Things That Every Scuba Diver Should Know About Sharks
Sharks are fascinating creatures that are not particularly dangerous to divers. Learn basic sharks facts and information, as well as fun shark trivia. Did you know that a shark can . . . .

What Is the Best Way to Prevent Water From Entering Your Scuba Cylinder?
What is the best way to prevent water from entering your scuba cylinder? Always keep a little gas in the tank -- but there is one more way for moisture to get in . . .

What Does Scuba Stand For?
The term

How to Treat a Lionfish Sting - First Aid for Scuba Divers
Lionfish have poisonous spines that can inject a powerful neurotoxin if touched. Learn about first aid and basic facts for lionfish stings.

Every Scuba Diver Should Carry a Back-Up Mask on Every Dive
Should you get a back-up mask for scuba diving? YES! Although they are not required diving gear, every diver should carry a back-up mask to ensure a safe ascent in the even of mask failure.

Salt Water Aspiration and Scuba Diving
Salt water aspiration syndrome can during or after diving when a scuba diver inhales salt water. Symptoms include difficulty breathing and chest pain.

How Old Do You Have to Be to Scuba Dive?
How old do you have to be to scuba dive?The minimum age for scuba diving with most training organizations is 8 years, with certifications be awarded as young as 10 years old.

What Is Oxygen Toxicity in Scuba Diving?
Oxygen toxicity is a danger to scuba divers who dive beyond the recreational limits, use nitrox, or use 100% oxygen as a decompression gas.

What is Nitrox in Scuba Diving?
What is nitrox? Nitrox is defined as mixture of nitrogen and oxygen gases and is commonly used in scuba diving.

Why Introverts Love Scuba Diving
Scuba diving is generally considered and exiting and stimulating adventure sport, yet many introverts are drawn to this relatively social activity, why?

What Is Enriched Air Nitrox in Scuba Diving?
Enriched air nitrox is a mixture of oxygen and nitrogen that has an oxygen percentage greater than 21%. It is used by scuba divers to extend no-decompression limits.

Little Bubbles Can Lead to Big Trouble in Diving
Small bubbles leaking from a piece of scuba diving equipment indicated that a seal or o-ring is likely to fail. Divers who notice a small bubbles coming from a piece of dive gear should take care to fix the leak before continuing to dive with the gear.

Are Sea Turtles Endangered?
How can scuba divers help sea turtles to survive? All sea turtles species are either vulnerable, threatened or endangered. Here are tips for divers interested in saving their underwater friends.

Definition of "Diluent" in Rebreather Diving?
In rebreather diving, diluent gas is a blend of nitrox, trimix, heliox (or even air!) which is combined with pure oxygen to create an optimal breathing gas mixture for the dive plan.

Sea Turtle Facts and Identification for Scuba Divers
What type of sea turtle did you just see on your dive? Was it an endangered species? Learn about the different species of sea turtles and more.

Why Does It Look Blurry When I Open My Eyes Underwater?
Your vision will look blurry if you open your eyes underwater because light refracts differently through air and water. Using a scuba diving mask can solve this problem.

What Is a Balanced Regulator in Scuba Diving?
What is the difference between balanced and unbalanced regulators in scuba diving? Which should you buy?

How to Deal With Task Loading and Complex Skills When Scuba Diving
Task loading is a common problem faced by scuba divers attempting complicated activities underwater. When a diver attempts to do too many things at once, he may fail to do even one thing properly.

What Is the Minimum Age for Scuba Diving?
How old do you have to be to scuba dive? Most dive training organizations offer scuba diving lessons for kids starting at the age of eight. Kids older than 10 years old can enroll in a diving certification course.

What Is a Safety Stop in Scuba Diving?
A safety stop is a three to five minute stop made between fifteen and twenty feet during ascent from a scuba dive. There are a number of reasons to make a safety stop on every dive.

Parts of a Scuba Diving Mask - All Masks Are Different
Different parts of a scuba diving mask with labels.

Scuba Diving Masks- Examine the Field of Vision
Examine the field of vision of a scuba diving mask.

Scuba Diving Masks- Examine a Scuba Diving Mask's Materials
Examine a scuba diving mask's materials before trying it on. Masks should be made of tempered glass and silicon.

Scuba Diving Masks- Check if a Scuba Diving Mask Seals
Inhale through your nose to check if the scuba diving mask seals.

Scuba Diving Masks- Simulate a Regulator in Your Mouth
Move your mouth to simulate a regulator in your mouth, the mask should still seal.

Scuba Diving Masks- Put the Scuba Diving Mask On
Put the scuba diving mask on with the strap and skirt in the correct position.

Scuba Diving Masks- Check a Mask for Tight Spots
Check a scuba diving mask for tight spots where the mask may press painfully against your face.

Scuba Diving Masks- Check the Air Space Inside the Scuba Diving Mask
Masks with a smaller interior air space are preferable.

Scuba Diving Masks- Position a Scuba Diving Mask on Your Face
Position a scuba diving mask on your face correctly.

Scuba Diving Masks- Try to Equalize
Make sure you can pinch your nose closed and equalize through your scuba diving mask.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

20 Fish Species of Puget Sound & the Northwestern USA
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.

Pacific Fish Identification Guide - Puget Sound Washington Northwest United States
Pacific fish identification guide to the Puget Sound, Seattle, and Washington. Learn trivia and see photos of 20 common fish and animal species along the Northwest of the United States.