1. Sports
Send to a Friend via Email

Your suggestion is on its way!

An email with a link to:

http://scuba.about.com/popular.htm

was emailed to:

Thanks for sharing About.com with others!

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.
How Divers Should Equalize Ear Pressure
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.
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.
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.
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.
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.
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.
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.
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.
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.
All About Decompression Sickness
An overview of Decompression Sickness, including causes, types, symptoms, risk factors, prevention, and treatment.
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.
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 Equipment Do You Need to Scuba Dive?
Learn about the basic equipment required for scuba diving, and what dive gear you should buy first.
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.
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.
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.
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.
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.
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 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.
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 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.
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.
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.
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?
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 . . .
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,
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.
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.
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.
Open Water Certification
Answers to your basic questions about Open Water Certification.
What Does SCUBA Stand For?
: What Does SCUBA Stand For? The term "scuba" was originally a capitalized acronym: SCUBA. These days,
How to Clear a Scuba Mask of Water
A scuba diver allows water to enter her scuba mask in a controlled manner. Mask clearing is an important open water scuba certification skill.
4 Types of Freediving Training That You Can Do...
Freedivers can train to improve performance without ever getting wet. Learn to use the carbon dioxide tables, oxygen tables, and apnea walk for freediving training.
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.
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 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.
The Pre-Dive Safety Check for Scuba Diving
The scuba diving pre-dive safety (or
PADI's Order of Priority for Low-on-Air/ Out of...
Explanation of the PADI knowledge review question
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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!
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.
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.
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.
5 Ways to Keep Your Hair Out of Your Face When...
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. Page 5.
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.
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.
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.
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.
Air Consumption Rates for Scuba Diving - SAC...
Formulas for calculating a scuba diver's surface air consumption rate (or SAC Rate) in both Metric and Imperial format.
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?
Freediving
Freediving is a sport in which a diver descends in the water using a single lungful of air. Learn about the basics of free diving, as well has how it differs from scuba diving.
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.
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.
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.
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.
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?
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 . . .
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.
Why Do You Need a Dive Light?
Scuba Diving Lights - Why Do You Need a Dive Light
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.
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.
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.
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.
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!
Technical Diving and Photography Lights
Scuba diving lights for technical diving, photography, and videography
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.
Recreational Scuba Diving Lights
Recreational Scuba Diving Lights
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.
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.
Seahorses and Pipefish - Facts for Divers
Seahorses and Pipefish- Facts and Information for Scuba Divers
Under-Emphasized Dive Skills: Mastering a...
Controlled Descents in Scuba Diving
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.
How to Try on a Scuba Diving Mask
Different parts of a scuba diving mask with labels.
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.
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.
Open Water Skills
A description of each of the water skills taught during the Open Water Diver certification course.
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.
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.
Identify Fire Coral
Learn to identify fire coral stings. Divers must learn to identify fire coral stings to properly treat them.
What Is Recreational Diving
Recreational diving is defined as scuba diving within certain limits. Recreational diving is less than 130 feet deep, does not require decompression stops, and allows the diver to ascend directly to the surface.
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?
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.
5 Ways to Support Coral Conservation Without...
Scuba divers can support marine and coral conservation even when they are not diving. Learn five ways to conserve reefs without getting wet.
BCDs: Vest-Style Versus Back Inflation
What is the difference between a vest-style and a back inflation BCD?
Open Water Skill: Free Flowing Regulator
How to perform the Open Water skill 'Free Flowing Regulator'
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.
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.
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.
What is Deep Diving?
Learn all about the thrilling world of deep diving.
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.
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.
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.
The Art of Equipment Configuration - 5...
How should you configure your scuba diving gear for optimal comfort and functionality? Learn 5 basic rules of scuba diving equipment configuration for all divers, regardless of their type of diving or scuba system.
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.
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.
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.
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.
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.
8 Regulator Mouthpieces
Scuba diving mouthpieces come in a variety of styles. See an illustrated list of common types of scuba diving regulator mouthpieces.
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.
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.
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.
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.
Is the The Great Pacific Garbage Patch Really...
The Great Pacific Garbage Patch is located in the middle of the North Pacific Ocean. Click through a short lesson and photos of this island of trash, and learn what you can do to help.
Moray Eels - Facts and Information for Scuba...
Is scuba diving with moray eels dangerous? No! Moray eels are fascninating and harmless to scuba divers unless threatened. Learn about moray eel facts and information here. Page 2.
Patent Foramen Ovale and Diving
What is a Patent Foramen Ovale (PFO) and why might it increase a diver's chance of decompression illness or DCI? A patent foramen ovale as a hole in a diver's heart that has not properly closed during development. Up to a third of divers have this condition, which may increase the risk of decompression illness.
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.
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.
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.
First Aid and Facts About Lionfish Stings for...
Lionfish have poisonous spines that can inject a powerful neurotoxin if touched. Learn about first aid and basic facts for lionfish stings.
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.
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.
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.
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 Cave Diving? Facts and Absolute Basics
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.
7 Types of Freediving
The different types of freediving (apnea) include static, dynamic, constant weight with fins, constant weight without fins, variable weight, and no limits. Learn about the these freediving disciplines and compare and constrast the differences between them.
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.
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.
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
5 Courses to Advance Your Scuba Diving...
Take the next step in scuba diving! Learn about how to advance your scuba diving certification with courses from 5 of the most popular scuba diving organizations. Learn what the required prerequisites and age limits for different scuba diving certification agencies.
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
Little Bubbles Become Big Bubbles
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.
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.
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.
My First Dive - Scuba Diving Stories
Read a short essay about my first scuba dive, and find links to more scuba diving stories by a professional scuba instructor.
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.
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.
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.
What is Enriched Air Nitrox?
What is enriched air nitrox? Enriched air nitrox is a mixture of oxygen and nitrogen that has an oxygen percentage greater that 21%. Enriched air nitrox is used by scuba divers in recreational and technical diving.
Silicon Color
Different colors of silicon are available in scuba diving masks. Learn about scuba diving mask styles and features. Page 9.
Open Water Skill: Proper Weighting
How to perform the Open Water skill 'Proper Weighting'
10 Hints For Perfect Buoyancy Control
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. Here is a list of ways to improve your buoyancy.
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.
You can opt-out at any time. Please refer to our privacy policy for contact information.

©2014 About.com. All rights reserved.