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Scuba Diving: Most Popular Articles

These articles are the most popular over the last month.
A Scuba Diver's Guide to Identifying Rays
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.
8 Ways to Prevent Your Scuba Diving Mask From...
Prevent scuba diving masks from fogging. New and used scuba diving masks need to be treated in different ways to prevent them from fogging.
Scuba FAQ: 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.
Do Sea Urchins Have Venomous Spines?
Are sea urchins poisonous? Learn sea urchin facts, how to safely dive and snorkel urchins, and the first aid for sea urchin stings.
The Difference Between DIN and Yoke Scuba...
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.
Reef Fish Identification Guide - 20 Common...
Reef fish identification guide for scuba divers to common and interesting species in Florida and the Caribbean. Learn to identify Sergeant Majors (Abudefduf saxatilis), Porkfish (Anisotremus virginicus), French Grunts (Haemulon flavolineatum) and many more reef fish species.
The Most Common Scuba Diving Injury and How to...
Ear barotraumas are the most common injuries experienced by recreational scuba divers. Learn how to recognize, avoid and treat scuba diving ear barotraumas.
How to Equalize Your Ears for Scuba Diving
How do scuba divers equalize their ear pressure to avoid ear pain when diving? Learn about the Valsalva maneuver and other ear equalization techniques, as well as how to deal with common equalization problems.
Safely Dive With Stingrays
Learn about stingray facts, information, how to scuba dive with them safely, and first aid for stings. Stingrays are not dangerous unless they feel threatened,
Can You Dive on Your Period? Menstruation and...
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.
How to Get Started in Scuba Diving
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.
The Pre-Dive Safety Check for Scuba Diving
The scuba diving pre-dive safety (or
7 Tips for Putting on a Wetsuit More Easily
Do you have trouble getting into your tight-fitting wetsuit? Here are seven tricks to putting on a wetsuit more easily.
What Is a No-Decompression Limit?
A no-decompression limit (NDL) is a time limit for a scuba dive. If a diver exceeds the no-decompression limit for his dive, he can no longer ascend directly to the surface.
How Long Does a Scuba Tank Last?
An average scuba diver on a forty foot dive can stay underwater about 45 minutes. However, the length of time the air in a scuba tank lasts will vary depending upon depth, tank volume, and the diver's air consumption rate.
How Safe is Scuba Diving and What Are the Risks?
Is scuba diving a safe activity? Read statistics and facts to put the risks of diving in perspective. Scuba diving is not dangerous if simple safety guidelines and procedures are followed.
What Scuba Divers Need to Know About Depth and...
Water pressure increases with depth. Water pressure effects almost all aspects of scuba diving, include equalization, buoyancy, bottom times, and the risk of decompression sickness (DCS). Review basic dive theory regarding depth and pressure in scuba diving.
What to Expect on Your First Scuba Dive
What is scuba diving like? The underwater world looks, feels, and sounds different from the terrestrial one. Here's an article for new divers about what to expect on their first scuba dive.
How Deep Can a Person Scuba Dive?
The deepest dive on open circuit scuba was 1082 feet by Pascal Bernabe, however recreational scuba divers should not exceed 130 feet. Learn about the reasons for recreational scuba diving depth guidelines as well as the training is required to safely exceed them.
What Equipment Do You Need to Scuba Dive?
Learn about the basic equipment required for scuba diving, and what dive gear you should buy first.
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.
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.
What Is the Difference Between Steel and...
What is the difference between steel and aluminum scuba tanks? Steel and aluminum scuba tanks differ in their weight, capacity, pressure ratings and buoyancy characteristics. Learn how the differences between steel and aluminum tanks effect scuba divers.
Are You the Right Age and Healthy Enough to...
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.
Poor Eyesight and Scuba - Diving With...
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.
All About Decompression Sickness
An overview of Decompression Sickness, including causes, types, symptoms, risk factors, prevention, and treatment.
Scuba Diving Skills and Techniques
What are some of the basic scuba diving skills and techniques? This review lists some of the typical skills and techniques learned in open water scuba diving certification courses and scuba classes.
Why Dive 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?
5 Ways to Keep Your Hair Out of Your Face When...
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.
What Suba Divers Need to Know About Buoyancy
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.
Open Water Certification
Answers to your basic questions about Open Water Certification.
Buoyancy in Salt Water vs Fresh Water
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 . . .
The 5 Basic Parts of a Scuba Regulator
Lean about the different parts of a scuba diving regulator. There are 5 basic scuba diving regulator parts, the first stage, seconds stage, alternate second stage, low pressure inflator hose, and submersible pressure gauge.
How to Try on a Scuba Diving Mask
Different parts of a scuba diving mask with labels.
Why Marine Protected Areas Matter to Divers
Marine Protected Areas (MPAs) serve as valuable sources of coral and fish that can repopulate our depleted oceans, and MPAs can also make fantastic dive sites for responsible. divers!
Dangerous Fish and Sea Animals
Which fish and sea animals are dangerous to scuba divers, and which are not? Click through this list of commonly feared sea animals and learn which ones are actually dangerous.
Scuba Diving Certification Agencies
An overview of popular scuba certification agencies, such as PADI, SSI, BSAC and NAUI. Explanation of what a scuba certification agency is, what is does, and the differences between agencies.
Nitrogen Narcosis and Scuba Diving Part I -...
Nitrogen narcosis affects most scuba divers at depths below 100 feet and can be dangerous. Learn about its causes, symptoms, and treatment.
Submerge Yourself in Basic Scuba Diving...
An overview of scuba diving as a sport and profession. All about the what, who, why, where, and how of scuba.
Air Consumption Rates for Scuba Diving - SAC...
This tutorial leads divers through the basics of air consumption rates for diving. Learn about SAC Rates, RMV Rates, how to calculate them , and use them to plan a dive.
Boyle's Law and 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.
Five Point Descent
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.
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.
What Does SCUBA Stand For?
: What Does SCUBA Stand For? The term "scuba" was originally a capitalized acronym: SCUBA. These days,
Fitness to Scuba Dive
A guide to the basic levels of health and fitness required to scuba dive. Features a check list of common medical problems that may prevent you from being able to scuba dive.
Is Scuba Diving With Sharks Dangerous?
Is scuba diving with sharks dangerous? No! In fact, a person is more likely to die falling out of his bed or injure himself using the toilet than to be the victim of a shark attack.
Open-Heeled vs Full-Footed Fins
What is the differnce between full-footed and open-heeled scuba diving fins, and which is right for you?
6 Steps to a Controlled Descent - Make Descents...
Many divers (even certified scuba divers) find descent the most stressful part of the dive because they have trouble controlling the descent. Learn techniques and hints to have a more enjoyable descent.
Reverse Block and Scuba Diving
What is a reverse block in scuba diving? If a diver experiences increased pressure in his ears during ascent, the worst thing he can do is to continue to go up.
Open Water Skills
A description of each of the water skills taught during the Open Water Diver certification course.
Dive Flags
Scuba divers should always fly a dive flag at dive sites where boat traffic is a possibility. Learn about the different types of dive flags and when to use them.
First Stage
See a diagram of the basic parts of a scuba diving regulator first stage. Learn about the different parts of s scuba diving regulator. Page 2.
What Is Commerical Diving? Thoughts from a Pro
A commercial dive is not about the time, the depth, the experience, or the adventure; it is about the money. Learn about commerical diving from a pro.
What Is the Maximum Safe Ascent Rate for Scuba...
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?
The Sponge Analogy - Understanding Nitrogen...
During a dive, a scuba diver's body absorbs nitrogen. Understand the concept of nitrogen absorption when scuba diving using the sponge analogy.
How Does a Regulator Work? A Beginner’s...
How does a scuba diving regulator work? Learn about regulator first stages and second stages, and how they reduce tank pressure to a pressure breathable by scuba divers. This is the first in an installment of regulator articles for beginners by guest author Matt Dunne.
Snorkels With Purge Valves
Learn about snorkels with purge valves. 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. Page 6.
Is Scuba Diving Safe for Kids?
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.
Fish Identification Guide - 20 Species of Puget...
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.
Scuba Fins Styles and Features
Photos and explanation of the features an styles of scuba diving fins. Learn about scuba fins before deciding on a purchase.
Parts of a Scuba Diving Regulator
Lean about the different parts of a scuba diving regulator. There are 5 basic scuba diving regulator parts, the first stage, seconds stage, alternate second stage, low pressure inflator hose, and submersible pressure gauge.
10 Things That Change When You Start Scuba Diving
Scuba divers tend to exhibit behaviors and characteristics that are not common to the general population. How many of these apply to you?
Open Water Swimming Tests
I frequently get questions on the difficulty of the water skills tests. The good news is that they're not difficult at all, and I've written some tips below to make them even easier.
Asthma and Scuba Diving
Can asthma sufferers scuba dive? It can be extremely dangerous for some asthmatics to dive. Learn why asthma is sometimes a contraindication for scuba diving.
Overcome the Fear of Having Water in Your Scuba...
Are you afraid of getting water in your mask when scuba diving? You are not alone! Here are tips that I use to help my scuba diving students overcome the common fear having water in the mask while diving.
Sea Turtles
Sea turtle home page for scuba divers. Learn about sea turtle species and identification. Find facts ad information about sea turtle habitat, eating, and conservation.
7 Risks and Limitations Associated With Diving...
Scuba diving with enriched air nitrox has limitations and risks. The use of enriched air nitrox increases the risk of oxygen toxicity and explosion. Considerations for scuba diving with enriched air nitrox include depth, cost, availability, complicated dive planning, and the necessity of special gear.
How Does a Wetsuit Keep a Scuba Diver Warm...
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.
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. Recreational scuba divers should make a safety stop at the end of every dive.
How to Frog Kick
Learn how to frog kick, a finning technique for scuba diving. Here is a step-by-step illustrated guide to learn how to frog kick properly when diving.
Primary Second Stage
Learn about the different parts of a scuba diving regulator second stage. See photos and read a description of the parts of a seconds stage scuba regulator. . Page 3.
Scuba Diving Certification Options - The Open...
The open water referral course allows divers to earn their scuba diving certification in segments. Student divers complete the theory and pool practice with a local dive shop before traveling anywhere in the world to finish their open-water check out dives.
PADI's Order of Priority for Low-on-Air/ Out of...
Explanation of the PADI knowledge review question
Dry Top Snorkels
Learn about dry top snorkels. 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. Page 4.
Scuba Diving Lessons for Kids
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.
The Most Important Rule in Scuba Diving - Never...
State the most important rule in scuba diving -- open water certification questions. According to PADI, the most important rule of scuba diving is to never hold your breath underwater. Learn 3 reasons for this rule.
What Is Freediving? Comparison of Freediving vs...
Freediving is an increasingly popular sport in which a diver uses breath holding techniques to maximize his time or swimming distance underwater
Skin Bends - A Frequently Overlooked Form of...
A frequently overlooked form of decompression sickness in scuba divers, learn how to recognize the common signs and symptoms of skin bends.
Identify Fire Coral
What is fire coral? See a definition and photos of fire coral.
Dive Theory
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's the Difference Between These Masks?
This guide to how to choose a scuba diving mask will familiarize you with the common mask styles and features. Never purchase a mask before learning about the different types available. There are such a variety of high quality masks available that there is sure to be one that is right for you!
Whale Shark Facts for Scuba Divers
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.
Alternobaric Vertigo and Scuba Diving
Alternobaric vertigo is a common type of vertigo experienced when scuba diving. Thankfully, it lasts a short period of time and resolves on its own. Here are tips for dealing with alternobaric vertigo and dizziness underwater.
Why Is Underwater Vision Blurry without a Mask...
Human eyes are made to see in air, not in water. A person who opens his eyes underwater has blurry vision due to the different refractive properties of water. A scuba mask or pair of goggles holds air against a person's face, allowing him to focus his eyes as he would on land -- just remember to use a mask (not goggles) when scuba diving.
Why Does Spit Keep a Scuba Mask From Fogging?
Why does spit keep a mask from fogging? Spit keeps a scuba diving mask from fogging because it acts as a surfactant . . .
Pulmonary Barotrauma and Scuba Diving
Every scuba diver is at risk of a pulmonary barotrauma if he holds his breath underwater. However, other conditions and actions can cause a pulmonary barotrauma when scuba diving. Learn how to avoid and recognize a pulmonary barotrauma.
How Freediver Jessea Lu Set 5 National Records...
Freediver Jessea Lu went from novice to Chinese national record holder in just under one year. Learn about her recent competition and read her tips in this interview.
What Are the Emergency Decompression Guidelines...
What are the emergency decompression rules for scuba diving? Guidelines for emergency decompression state that a scuba diver should remain at fifteen feet for either eight or fifteen minutes, depending upon how long he exceed his no-decompression limit.
Bearded Fireworms Deliver a Painful Sting
Bearded Fireworms- Bearded Fireworms are beautiful, but can be quite painful to touch. Divers should stay well away from bearded fireworms, and be aware of appropriate first aid for bearded fireworm stings.
Rigid Snorkels
Learn about rigid snorkels. 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. Page 7.
Why Does Scuba Diving Make You Need to Pee in...
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.
What is Deep Diving?
Learn all about the thrilling world of deep diving.
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.
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?
Open Water Skill: Free Flowing Regulator
How to perform the Open Water skill 'Free Flowing Regulator'
Open Water Certification Course Options
Several different formats of the Open Water Scuba Diver Course exist. Students considering enrolling in a scuba certification course should consider the different course options such as a referral courses and online learning options.
Sound Travels About 4 Times Faster in Water...
Does light or sound travel through water faster? Sound travels through water about 4 times faster than in air. Read-in depth answers to this and other PADI Open Water Course Knowledge Review Questions here.
Can You Vomit Underwater While Scuba Diving?
Can you vomit or throw up underwater. If you get seasick on boats, you maybe worried about getting seasick underwater. While becoming seasick underwater is highly unlikely, here is information that scuba divers should know about vomiting underwater.
8 Regulator Mouthpieces
Scuba diving mouthpieces come in a variety of styles. See an illustrated list of common types of scuba diving regulator mouthpieces.
Mask Squeeze - Red Eyes and Bruised Cheeks...
To prevent mask squeeze, a scuba diver must equalize the air space inside his scuba mask during descent by exhaling periodically through his nose. Doing so will prevent the mask from suctioning onto his face, which can cause bruising of his cheeks, forehead, and eyeballs.
Jellyfish Stings - Facts, Treatments, and...
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. Learn jellyfish facts, symptoms of a sting, and information about first aid treatments/remedies.
7 Types of Freediving Equipment (Gear)
Learn about 7 tyoes of freediving equipment. Freediving gear includes masks, snorkels, fins, wetsuits, and as surface support station. Learn about freediving gear, and what makes it different from scuba diving gear.
Factors That Affect Visibility Underwater When...
What are factors that effect the visibility underwater when scuba diving? The PADI knowledge review lists several factors that influence the clarity of water, learn about these and other factors such as salinity.
Oxygen Toxicity and Scuba Diving
Scuba divers risk oxygen toxicity when they expose themselves to high partial pressures of oxygen. Central Nervous System (CNS) Oxygen Toxicity causes convulsions, unconsciousness and even death in scuba divers. Pulmonary Oxygen Toxicity causes coughing, difficulty breathing and eventual failure of the lungs, and effects mainly technical scuba divers.
What is Partial Pressure and Why Is It...
What is partial pressure and what does it have to do with scuba diving? Partial pressure is a way that divers measure the concentration of a gas. Knowing the partial pressure of a gas is important because the physiological and psychological effects of the many gasses change with an increase in partial pressure.
How to Wash Your Scuba Gear
One of the most important skills you'll learn as a diver is how to properly wash your scuba equipment. It's very important to wash your scuba equipment thoroughly after every day of diving. Washing your scuba gear ensures that it all performs safely as it was intended to and it will also prolong its life.
Regulator First Stages: Piston vs Diaphragm -...
What is the difference between a diaphragm and a piston regulator first stage, and which is better? The short answer is that both are very good, but there are some differences to consider when choosing a scuba diving regulator.
Maximum Operating Depth (MOD) and Scuba Diving
A Maximum Operating Depth (MOD) is a depth limit based on the concentration of oxygen in a scuba diver's tank. Learn about the situations in which a scuba diver must calculate a maximum operating depth and see the MOD formula.
BCDs: Vest-Style Versus Back Inflation
What is the difference between a vest-style and a back inflation BCD?
Flexible Snorkels
Learn about flexible snorkels. 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. Page 8.
3 Pieces of Gear Every Diver (and Student...
There are three pieces of scuba gear that every scuba student and certified scuba diver should own. Learn about the basic styles and features of the three most important pieces of scuba gear.
Discover Scuba Diving
An overview of the PADI Discover Scuba Diving program. A program that allows you to try diving under close supervision of a professional dive instructor.
Surface Intervals (SI) and Scuba Diving
What is a surface interval (SI) in scuba diving? A surface interval is the time a diver spends above water in between two dives. To stay safe and comfortable, a diver should
BARE Velocity Wetsuit Review
Read a review of BARE Wetsuits. Learn about fit, durability and features of the BARE Velocity wetsuit.
Mask Attachments
Learn how to attach a snorkel to a mask. 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. Page 10.
Residual Nitrogen Time (RNT) and Scuba Diving
What is residual nitrogen time in scuba diving? This explanation will help divers to understand what residual nitrogen time represents and how to use this number in recreational diving when calculating repetitive dive parameters.
Masks With Optical Lenses
Scuba diving masks can be created for use with corrective lenses. Learn about scuba diving mask styles and features. Page 8.
How Do Refresher Courses Benefit Certified...
Refresher courses make scuba diving safer and more enjoyable. Certified scuba divers should enroll in a refresher course to review emergency skills and important dive theory after a period of diving inactivity.
Decongestants and Scuba Diving
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.
Where Should a Scuba Diver Attach His Alternate...
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.
Do You Need to Know How to Swim to Scuba Dive?
Do you need to be able to swim to scuba dive? Scuba experience programs do not require that students know how to swim, but certification courses do.
Decompression Sickness vs Nitrogen Narcosis -...
In scuba diving, nitrogen narcosis and decompression sickness are both caused by nitrogen gas. However, the two conditions have very different symptoms and treatments. Learn the difference between nitrogen narcosis and decompression sickness in scuba diving.
Open Water Skill: Proper Weighting
How to perform the Open Water skill 'Proper Weighting'
How to Preform the Controlled Emergency...
The controlled emergency swimming ascent allows a scuba diver to safely surface in an out-of-air emergency without the help of his buddy. Scuba divers learn the controlled emergency swimming ascent during their open water certification course.
BCDs For Scuba Diving - Definition, Basics, and...
Here is an easy starting point to learn about BCDs and Scuba Diving, including the three main purposes of BCDs, what kind you should buy, and more.
Carbon Dioxide and Scuba Diving
High levels of carbon dioxide (hypercapnia) can cause a variety of dangerous symptoms in scuba divers, such as narcosis and unconsciousness. However, high carbon dioxide levels are avoidable if a scuba diver follows safe diving practices and avoids behavior that may predispose him to hypercapnia.
Snorkels Without Purge Valves
Learn about snorkels without purge valves. 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. Page 5.
Creative Uses for Old Scuba Tanks
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.
Scuba Fins With Closed Heels
Images of scuba fins with closed heels. Photos and explanation of the features an styles of scuba diving fins. Learn about scuba fins before deciding on a purchase. Page 2.
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.
What Is Open Water?
What does open water mean in scuba diving? In scuba diving, open water is usually defined by parameters such as being less than 130 feet deep and not in an overhead environment. Learn more about open water and other diving terminology here.
Seahorse Camouflage
Seahorses, like the Thorny Seahorse in this photo, can change colors and even textures to camouflage with their environment. See photos and learn facts about seahorses and pipefish in this scuba diving photo gallery. Page 5.
Light and Compact BCDs Developed For Travelers
Three great travel BCDs are the Aqualung Zuma, the Cressi Travel Light, and the Seacsub Airone are now on the market.
Turtle Fins
Images of turtle fins. Photos and explanation of the features an styles of scuba diving fins. Learn about scuba fins before deciding on a purchase. Page 8.
Freediving Physiology Basics
How does a freediver hold his breath for so long underwater? Learn about the basic physiology of freediving, including the roles of carbon dioxide and oxygen in increasing breath hold time.
Mouthpieces
Learn about snorkel mouthpieces. 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. Page 9.
What Is the Definition of a Squeeze in Scuba...
What is the definition of a squeeze in scuba diving? A squeeze can be uncomfortable and even painful. Learn about what causes a squeeze in scuba diving and how to prevent one.
Review: Omer Zero Cubed Diving Mask
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.
Scuba Fins With Open Heels
Photos and explanation of the features an styles of scuba diving fins. Learn about scuba fins before deciding on a purchase. Page 3.
Submersible Pressure Gauge and Console
Learn about the submersible pressure gauge (SPG) and other gauges located on a scuba diving regulators console. See a digram of a scuba diving SPG and gauge console. . Page 6.
Salt Water Aspiration and Scuba Diving
Salt water aspiration syndrome is a rare condition occasionally observed in scuba divers who inhale a small amount of salt water. Most cases are preventable with proper gear maintenance and good diving protocols.
Low Pressure Inflator Hose
See a diagram of a scuba diving low pressure inflator hose. Learn about the different parts of a scuba diving regulator. Page 5.
Scuba Tip: Preventing Blisters on Your Feet and...
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.
How Old Do You Have to Be to Scuba Dive?
How old do you have to be to scuba dive? Children can begin scuba diving from a young age . . .
Small Fit Masks
Small fit scuba diving masks are adult masks for smaller faces. Learn about scuba diving mask styles and features. Page 10.
Regulator Recovery Can Save Your Life
Photos and explanation of the regulator recovery skill. Regulator recovery is taught in most scuba certification courses and could someday save your life.
Stinging Hydroids - Facts and Sting Treatment
Stinging hydroids are members of the Hydrozoa class, which includes the portuguese man of war and fire coral.
Divers Can Learn by Observing Animal Behavior...
Learn about the ocean's food chain, or trophic web. Every fish and animal in the ocean plays an intergral role in the health of the entire marine ecosystem.
Strap Attachment
Strap attachments on scuba diving masks vary. Learn about different styles and features of scuba diving masks. Page 11.

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