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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.
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.
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.
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.
The Pre-Dive Safety Check for Scuba Diving
The scuba diving pre-dive safety (or
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.
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.
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.
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.
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.
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.
All About Decompression Sickness
An overview of Decompression Sickness, including causes, types, symptoms, risk factors, prevention, and treatment.
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 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.
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.
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,
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 Does SCUBA Stand For?
: What Does SCUBA Stand For? The term "scuba" was originally a capitalized acronym: SCUBA. These days,
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.
How to Clear a Scuba Mask of Water
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.
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 . . .
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?
How to Try on a Scuba Diving Mask
Different parts of a scuba diving mask with labels.
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.
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.
Open Water Certification
Answers to your basic questions about Open Water Certification.
5 Ways to Keep Your Hair Out of Your Face When...
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. Page 3.
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.
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.
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.
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.
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.
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.
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.
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.
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?
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.
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.
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.
Air Consumption Rates for Scuba Diving - SAC...
A measurement of the speed at which a scuba diver consumes his air. Learn difference between SAC Rate and RMV Rate, and when SAC Rate is useful.Page 4.
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 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?
PADI's Order of Priority for Low-on-Air/ Out of...
Explanation of the PADI knowledge review question
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.
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.
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.
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.
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.
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.
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.
Open Water Skills
A description of each of the water skills taught during the Open Water Diver certification course.
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.
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.
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?
8 Things to Do Beforehand to Make Your Next...
Doing your research, testing your dive gear, and packing carefully can make the difference between a perfect scuba trip and a frustrating one. Here are some suggestions for dive travelers.
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.
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.
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?
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.
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.
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.
Identify Fire Coral
Learn to treat fire coral images. First aid for fire coral images.
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 Schools International (SSI) Classified...
SSI's Classified Diver program is directly regulated by Scuba Schools International. The certification is offered through the same agency as their able-bodied counterparts.
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.
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.
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.
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.
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.
Five Point Descent
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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!
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.
What is Oxygen Toxicity?
Oxygen toxicity is a medical condition caused by exposure to oxygen at high pressures. Oxygen toxicity may be experienced by scuba divers who dive beyond recreational dive limits, used mixed gasses such as enriched air nitrox, and decompress using oxygen. These divers must take precautions to avoid oxygen toxicity.
Trim Part II: Five Ways to Position Your Body...
Proper trim is one of the most important scuba diving skills, but also one of the most overlooked. Here are 5 adjustments a diver can make to his body position to achieve proper horizontal trim in scuba diving.
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.
8 Regulator Mouthpieces
Scuba diving mouthpieces come in a variety of styles. See an illustrated list of common types of scuba diving regulator mouthpieces.
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
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 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.
BCDs: Vest-Style Versus Back Inflation
What is the difference between a vest-style and a back inflation BCD?
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.
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.
World Records of Freediving (Apnea) as of Jan...
The freediving (apnea) world records as of the beginning of 2013 are pretty incredible. Here is a list of freediving records in static freediving, dynamic freediving, constant weight freediving, variable weight freediving, and no-limits freediving.
Masks With Purge Valves
Purge valves can make it easy to clear water from a scuba diving mask. Learn about scuba diving mask styles and features. Page 7.
The Fin Pivot - Swim Like a Fish Using the Fin...
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.
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.
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. Page 19.
Silicon Color
Different colors of silicon are available in scuba diving masks. Learn about scuba diving mask styles and features. Page 9.
What is Deep Diving?
Learn all about the thrilling world of deep diving.
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.
Trim Part I: What Is Proper Trim and Why Will...
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.
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.
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.
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.
Strap Attachment
Strap attachments on scuba diving masks vary. Learn about different styles and features of scuba diving masks. Page 11.
Flounders - Facts and Information for Scuba...
Flounders are among some of the most difficult fish to spot underwater. They are also some of the most interesting. Here are some interesting flounder facts and trivia for scuba divers.
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.
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.
Challenges and Threats
Seahorse populations around the world are in a steady decline caused by overfishing, habitat destruction, and pollution. Learn more about seahorses and pipefish in this scuba diving photo gallery. Page 12.
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.
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.
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.
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.
Learn to Dive Online
How can you learn to scuba dive online? Online scuba diving certification courses allow student divers to save time by completing the theory portion of scuba diving courses online.
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.
Seahorses Anchoring Behavior
Seahorses must anchor to coral or other fixed objects in order to conserve energy and survive. See photos and learn facts about seahorses and pipefish in this scuba diving photo gallery. Page 6.
Alternate Second Stage
See a diagram and explanation of the parts of a scuba diving regulator second stage. Learn about the different parts of a scuba diving regulator. Page 4.
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.
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.
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.
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.
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 . . .
Nitrogen Narcosis and Scuba Diving Part II -...
A diver who experiences nitrogen narcosis should ascend until the narcosis subsides. Learn tricks to avoid and reduce nitrogen narcosis here.
Small Fit Masks
Small fit scuba diving masks are adult masks for smaller faces. Learn about scuba diving mask styles and features. Page 10.
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.
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.
Fantastic Photos of Mozambique Diving
Photographs of the amazing variety of life that Mozambique diving offers. From bottlenosed dolphins and bull sharks to tiny porcelain anemone crabs, Mozambique diving is some of the most pristine scuba diving in the world.
8 Tips for Being a Better Dive Buddy
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.
Pressure Groups and Scuba Diving
What is a pressure group in scuba diving? A pressure group is an alphabetical representation of the amount of nitrogen a diver has absorbed after diving or after a surface interval. For safe diving, a diver should
Eating and Drinking 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.
PADI’s Revised Open Water Course -...
PADI's Revised Open Water Course incorporates electronic media and new skills with the aim of created more confident and competent divers.
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!

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