The Physics of Diving – Scuba Gas Laws Theory
An explanation of the Scuba Gas Laws for Diving. Boyle's Law, Henry's Law, Charles Law, Dalton's Law, Oxygen Toxicity & Partial Pressures.
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Decompression Stress: Post-Dive Fatigue and Subclinical DCS
Sub-clinical DCS, decompression stress and post-dive fatigue. The impact of microbubbles on diver vitality and health.
Read MoreHow To Use A Pony Cylinder For Diving
A comprehensive 'how to' guide to pony cylinder benefits, selection, gas planning and usage. Everything you need to know about pony cylinders.
Read MoreHow Deep Can You Dive Using Air?
There are three governing factors which determine how deep can you dive using air. Understanding those factors promotes safe gas selection.
Read MoreUsing your BCD or a Drysuit for Buoyancy Control?
Should you choose your BCD or drysuit for buoyancy control? Find out the advantages and disadvantages of each option in this article.
Read MoreWhen To Drop Your Weight Belt On A Scuba Dive?
Learn when to drop your weight belt to survive a scuba diving accident. Tips and advice on weight belts and technqiues.
Read MoreCO2 Narcosis and Hypercapnia When Scuba Diving
Did you know that mild CO2 retention (hypercapnia) causes acute CO2 narcosis symptoms when you are diving? Don't assume it is nitrogen!
Read MoreChanging to an AIR-2 Octopus AAS
What are the pros and cons to changing to an AIR-2 regulator inflator octopus (AAS) system? What needs to be considered? Best AIR-2 systems?
Read MoreThe History of Subic Bay
The History of Subic Bay A concise history of Subic Bay, charting 500 years of turmoil, conflict and occupation The history of Subic Bay reflects many centuries of war and turbulence. The Bay has strategic significance as a protected deep-water…
How To Overcome Fear of Mask Removal When Scuba Diving?
Learn how to overcome fear of mask removal when scuba diving with these expert tips. Improve your skills and confidence underwater.
Read MoreScuba Diving Cylinders: Steel or Aluminium?
Understand the characteristics, benefits & drawbacks to scuba diving cylinders. This article helps you decide between steel & aluminum tanks.
Read MoreSheck Exley’s Razor – The Nature of Limits
Sheck Exley’s Razor – The Nature of Limits By R.D. Milhollin (Blog editor’s note: This article was first published in the March-April 1995, issue of Underwater Speleology. I have added it here on my blog to preserve and disseminate further, what I…
Nudibranch in Anilao Nudibranch – Philippines Underwater Photography
Anilao Nudibranch – Philippines Underwater Photography A gallery of colourful Anilao nudibranch photos, taken by Andy Davis, during a 1-week training expedition to Anilao in the Philippines. Anilao is often regarded as the ‘Nudibranch Capital of the World’ – and…
The Complement System When Diving: DCS And Immune Response
The Complement System and Diving by Dr. Ernest Campbell. The role of the immune response in sub-clinical DCS & decompression stress issues.
Read MoreThe Ultimate Buyer’s Guide To Choosing A Scuba Diving Wetsuit
Looking for the perfect scuba diving wetsuit? My buyer's guide for divers will help you learn about materials, sizes, features, care & more!
Read MoreRisk Assessment in Scuba Diving: The Key Steps To Safer Dives
Learn a step-by-step process for risk assessment in scuba diving and why it is vital to ensure your safety as a scuba diver!
Read MoreA Simple Guide To Dive Computer Algorithms
Not all dive computer algorithms are created equal. Learn the differences and make an informed decision when buying your next dive computer.
Read MoreThe Best Budget Dive Computers For Entry-Level Divers
The best budget dive computers 2023. Get value for money by understanding the features & functions. Unbiased advice to help you choose!
Read MoreTropical And Cold Water Diving: What’s The Difference?
Discover the difference between tropical & cold water diving. Learn the right dive gear & techniques for safe, enjoyable diving experiences.
Read MoreA Guide to SMBs and DSMBs for Scuba Diving
Learn how to choose, deploy, and maintain surface marker buoys (SMBs) and delayed surface marker buoys (DSMBs) for safe scuba diving!
Read MoreA Guide To Personal Locator Beacons (PLB) For Scuba Diving
Learn about Personal Locator Beacons (PLBs) for scuba diving. A divers guide to choosing, using, and maintaining a PLB for dive safety.
Read MoreThe Essential Guide to Emergency Signaling Devices for Scuba Diving Safety
Level up your scuba diving! A guide to emergency signaling devices: types, features, proper usage, and maintenance. Dive with reassurance!
Read MoreThe Ultimate Guide to Blackwater Diving
Discover blackwater diving with this ultimate guide! Learn about gear, safety, techniques, photography, marine life & best destinations.
Read MoreThe 10 Best Muck Diving & Macro Photography Sites in the World
Explore the 10 best muck diving sites for macro photography in the world. Learn about capturing stunning underwater photos of rare critters!
Read MoreMuck Diving in Subic Bay, Philippines
Muck diving underwater photography in Subic Bay, Philippines. Experience the rare marine life to be found in this photographer's paradise!
Read MoreShearwater Dive Computer Settings: A Guide to Gradient Factors
An illustrated guide to getting the best out of your Shearwater dive computer settings. Don't be intimidated by the advanced display options!
Read MoreHow Can I Make My Air Last Longer When Scuba Diving?
Make your air last longer when scuba diving by following these simply tips. Read the solution to end frustrattion of high gas consumption!
Read MoreRecreational Diving Limits: Assessing The Grey Area Versus Technical Diving
Recreational diving limits become increasingly blurred with technical diving. Why are limits required & how do divers need to consider them?
Read MoreHow To Best Ascend When Scuba Diving?
Three important tips on how to ascend when scuba diving. Read this to increase your safety and enjoy less fatigue after your dives!
Read MoreTop-5 Best Books For Diving Instructors!
The best books for diving instructors to improve teaching ability & train better divers. None of this was taught in your dive pro courses!
Read MoreWhat is Diving Experience? Can it Define an Expert Diver?
Divers often talk about diving experience. But what does that mean? Learn the difference between an experienced diver and an expert diver!
Read MoreDeep Diver Courses: What You Really Need To Know!
An honest appraisal of the training given on recreational Deep Diver courses versus the risks that exist on deeper dives.
Read MoreThe Best Ascent Speed for Scuba Diving
Learn the best ascent speed for scuba diving. Contrary to assumptions, slower is not always safer when it comes to diving ascent rate!
Read MoreWhy Do I Feel Tired After Diving? How To Avoid Post-Dive Fatigue
Do you feel tired after diving? Read this article to understand what REALLY causes post-dive fatigue & the simple steps needed to avoid it!
Read MorePro Tips For Choosing The Best Scuba Diving BCD For Your Needs
Honest pro tips on how to buy the best scuba diving BCD for your needs. Learn about BCD features, functions, designs and suitability!
Read MoreScuba Diving Regulator Buyers Guide
This honest and impartial scuba diving regulator purchase guide will save you money. Avoid making costly mistakes when buying expensive dive gear.
Read MoreWhat are the risks of deep diving?
Deep diving risks are badly educated on many dive courses. This article is a comprehensive guide to the hazards of deeper recreational diving.
Read MoreWhy Do More Diving Courses After Open Water Diver Certification?
What is the value of doing more diving courses after open water diver certification? It all depends finding a high quality course. Read how!
Read MoreScuba Diving Risk Management: Heuristics And Dive Safety
Learn how heuristic thinking harms scuba diving risk management. Read this to safeguard against cognitive biases for safe & successful dives!
Read MoreExperience is overrated. Diving ability matters!
Diving experience isn't the path to mastery. Read this to learn what is really necessary to develop expertise as a scuba diver!
Read MoreScuba Diving Mastery: The Deliberate Practice Approach
Deliberate practice is a methodology for the most efficient skill development. Learn how to fast-track your diving competency with this guide.
Read MoreDiving Stress Management & Scuba Diver Panic
A realistic examination of scuba diving stress management. What does it REALLY take for a diver to overcome panic when a dive goes wrong?
Read MoreScuba Diving Anxiety & CO2 Narcosis
Did you know that scuba diving anxiety can arise from CO2 narcosis? Learn why descent speed, gas density & exertion can affect your dives!
Read MoreScuba Diving Descent Speed: What You Need to Know!
This article has everything that you were never taught about scuba diving descent speed! What effects and issues does the descent rate have?
Read MoreWhat is the Difference Between a Divemaster and Dive Guide?
When taking a scuba diving vacation it's important to know whether you have a dive guide or a divemaster. Learn the crucial differences here!
Read MoreScuba Diving Trim
How to develop your scuba diving trim and become a more comfortable, confident & competent diver. Follow these simple tips for swift progress!
Read MoreDiving Certification: Do You Need To Get Qualified To Scuba Dive?
Learn the benefits of obtaining a scuba diving certification, including improved safety, access to more dive sites, & enhanced diving skills.
Read MoreNitrogen Narcosis: Why It Is Hard to Know You Are Narked
How do scuba divers perceive nitrogen narcosis? Is it possible to gauge your susceptibility to narcosis & make sound judgments to manage it?
Read MoreScuba Gas Planning: Gas Management For Divers
Learn scuba gas planning for your dives! A step-by-step guide to gas management for divers. Enhance your dive knowledge & safety underwater!
Read MoreAvoid Costly Mistakes When Buying Dive Gear
Honest expert pro tips to help prevent costly mistakes when buying your dive gear. Don't regret your scuba equipment purchases!
Read MoreThe Risks of Scuba Diving: Understanding the Hidden Dangers Underwater
Understand the potential risks of scuba diving and how to minimize them. Learn about the most common dangers and how to stay safe.
Read MoreScuba Equipment Shopping: How To Buy The Best Dive Gear!
When scuba equipment shopping it's easy to waste money on disappointing or inappropriate dive gear. These honest pro tip helps avoid costly mistakes!
Read MoreNo.5 | Horizontal Diver Trim
Stable diver trim is the foundation for good buoyancy control and efficient propulsion. It also helps conserve the marine environment.
Read MoreWhy Do Divers Use Helium?
Find out the three reasons why divers use helium in their breathing gas to increase diving safety. Scuba agencies havie differing policies on training for helium diving.
Read More10 Tips for New Divers to Rapidly Improve
Maximize your diving potential with these 10 tips for new divers to rapidly improve confidence, comfort and competency on your dives!
Read MoreHow To Use Less Air When Scuba Diving?
The question of using less air when scuba diving is one of the most pressing issues that a majority of newly qualified divers ask. The best way to use less air while scuba diving is to address the root cause of higher air consumption, not to focus on the symptoms.
Read MoreScuba Diving FAQs: Common Dive Questions and Expert Answers
Scuba diving FAQs answered by an expert professional diver with 30 years of dive experience! Essential tips for safe & enjoyable dives!
Read MoreUNESCO Marine World Heritage Sites That You Can Scuba Dive!
Discover 29 stunning UNESCO Marine World Heritage Sites for your diving bucket list. Awe-inspiring dives that promote marine conservation!
Read MoreMaster Scuba Diving Buoyancy Control Like A Pro!
Achieve effortless diving with these expert step-by-step tips. Master breathing, weighting, trim, & more. Use less gas & increase your safety!
Read MoreTop-5 Best Vacation Travel Diving Fins 2023 | Dive Gear Review
Lightweight diving fins that don't compromise on performance! Here is my pick of the best vacation travel scuba diving fins
Read MoreWhat is the best watch sized diving computer? | 2023
A comprehensive buying guide to the best watch sized diving computer. Explore the details & specifications to for the best informed decision!
Read MoreDoes Nitrogen Narcosis Impairment Persist?
A new study on nitrogen narcosis challenges the long held presumption that nitrogen narcosis impairment dissipates immediately on ascent from depth.
Read MoreThe Secret To Improving Your Air Consumption For Scuba Diving
The Secret To Improving Your Air Consumption by Andy Davis I encounter many novice divers who are dissatisfied, even frustrated, by their air consumption whilst scuba diving. High air consumption is often the controlling limit on dive time for novice-intermediate…
Bad Dive Buddy | How To Create A Safer Buddy System Dive Team
A bad dive buddy is stressful & dangerous. Follow this advice to develop a harmonious buddy system and boost your diving safety & enjoyment!
Read MoreNitrogen Narcosis Sedation & Consciousness
Nitrogen narcosis sedation is diminished consciousness: not the alcohol-like intoxication many divers are taught.
Read More7 Diving Buoyancy Facts That You Need To Know
Divers often struggle with their buoyancy. These essential tips are game-changing to set you on the right path for consistent improvement.
Read MoreWhat Are The Three Benefits Of Nitrox When Scuba Diving?
The three benefits of nitrox as a breathing gas for scuba diving. Is it worth the cost of training and more expensive cylinder fills?
Read MoreHow to Choose the Right Dive Center: An Honest Pro Guide
Discover the ultimate insider secrets to finding the perfect dive center! An honest proguide on how to pick a high quality dive shop or resort
Read MoreThe Pro Guide To Scuba Diving Suits
Discover the importance of diving suits for underwater exploration. From material to design, learn about the key features to look for.
Read MoreThe Ultimate Beginners Guide to Starting Scuba Diving
This beginners guide has all the information you need for starting scuba diving & ensures you get the most out of your underwater experience!
Read MoreBest Liveaboards for Tubbataha Reef Natural Park in the Philippines
If you are planning a trip to the Tubbataha Reefs Natural Park, a liveaboard is the only way to experience the beauty of this underwater world. In this article, I will discuss the best liveaboards that are available for exploring the Tubbataha Reefs Natural Park.
Read MoreAre You Ready For Solo Diving?
Examining the risks & personal factors that should be considered before attempting solo diving. Read this article before you dive alone!
Read MoreThe Best Diving Spots in the Philippines
The Philippines is a diver's paradise, with an abundance of stunning and diverse marine life, vibrant coral reefs, shipwrecks and crystal-clear waters
Read MoreHow To Find The Best Scuba Diving Course
Don't pay good money for bad training. Undertanding these factors will help you identify the best scuba diving courses available.
Read More10 Tips To Horizontal Hover When Scuba Diving
The ability to horizontal hover when scuba diving is the benchmark of fundamental skills proficiency. These tips will help you master hovering
Read MoreScuba Diving Buddy Separation Safety Protocols
Scuba Diving Safety Protocols: Buddy Separation by Andy Davis Losing your buddy is an easy way to ruining a good dive. Being alone underwater can cause many divers apprehension. It often also ends in an aborted dive – which sucks…
No.9 | Streamlined Dive Gear
The benefits of streamlined dive gear and how to achieve it with your own scuba diving equipment. Small kit changes can have big effects.
Read MoreNo.8 | Balanced Rig Principle For Diving
The balanced rig principle for diving describes a calculated approach to the amount of weight which can be jettisoned in an emergency
Read MoreNo.7 | Diving Ascents and Descents
How to improve your diving ascents & descents for safer and more comfortable scuba dives. This article can change your diving.
Read MoreNo.6 | Breathing and Scuba Buoyancy
How to control your breathing & scuba buoyancy for more comfort, confidence and competency as a scuba diver.
Read MoreNo.4 | Perfect Scuba Weighting
How to perfect your scuba weighting. Get this right & your buoyancy control will be much easier. Advice not taught in Open Water courses
Read MoreNo.3 | Achieving Great Scuba Buoyancy Control
This is how you achieve great buoyancy control when scuba diving. There are a few key things to know, then you will find it easy
Read MoreNo.2 | Scuba Buoyancy Control Benefits
What are the buoyancy control benefits for scuba divers? The reasons why it is worth devoting time & effort to developing core diving skillset
Read MoreNo.1 | Scuba Buoyancy Control for Divers
The benefits of improving scuba buoyancy control & how it can be developed in training & practice.
Read MoreMicro-Bubbles When Scuba Diving: Mild Bends And Sub-Clinical DCS
The effect of micro bubbles when scuba diving. Sub-clinical DCS may not merit a medical emergency, but should be understood and respected.
Read MoreLearning Scuba Diving Skills On Your Knees
Scuba diving skills taught in a kneeling position cause a plethora of problems for divers. Training in neutral buoyancy is very important!
Read MoreA Guide To Expert Scuba Diving Skill Development
A 'how to' guide for scuba diving skill development. A systematic tiered approach to ingraining fluent & intuitive dive proficiencies.
Read MoreDCS and the Immune System
DCS and the Immune System. How bubbles trigger an immune response that can make or break your body's fight against decompression sickness.
Read MoreA Buddy System Strategy for Air-Sharing Diving Emergencies
Don't get gas mugged - The role of situational awareness in predicting and avoiding stressful air-sharing emergencies in scuba diving
Read MoreAI Dive Computers | Using Air Integrated Transmitters for Diving
Are AI dive computers a valuable investment for divers? Honest pro advice on using transmitters with air integrated dive computers.
Read MoreWhat is the Balanced Rig Principle in Diving?
Balanced Rig Principle: improve diving safety with a calculated approach to the overall buoyancy dynamic. Survive BCD failures without drama.
Read MoreTypes of Decompression Sickness (DCS)
Decompression sickness types and symptoms. There are 4 medical catagorizations of DCS, along with sub-clinical DCS, aka decompression stress.
Read MoreUsing Your Hands Whilst Scuba Diving
Using your hands when scuba diving is inefficient for maneuvering. Learn how to break this habit and become a better scuba diver.
Read MoreHow to Judge Your Diving Ascent Rate Without a Dive Computer
Being able to judge your diving ascent rate is an invaluable safety skill if your computer or bottom timer fails. These tips show how!
Read MoreIs Solo Diving Safe?
Is Solo Diving Safe? Question: Is solo diving safe and recommended? What do I need to consider if thinking to go solo diving? Answer: Solo diving is ‘recommended’ insofar as most of the scuba training agencies have offered solo qualification…
Scuba Q&A: Deep Diving Below Recreational Agency Depth Limits
Scuba Q&A Question: I was taught that “recreational divers plan all dives to be no stop dives” and also that most agencies consider 40m /130 feet as the maximum depth for recreational deep diving. That seems inconsistent when my…
Scuba Q and A: Diver Stress, Relationships and Comfort Zones
Scuba Q and A: QUESTION: I am a recreational diver and I dive mostly with my husband. Our relationship issues (bickering) caused me stress. Is this a factor I should consider when scuba diving? Andy’s Answer: [no_toc] I know of…
Scuba Q&A: Why Do Decompression Divers Use Nitrox?
Why do technical decompression divers use nitrox in the shallower part of their dive? Using nitrox and oxygen reduces deco time & DCS risk.
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