
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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Sub-clinical DCS, decompression stress and post-dive fatigue. The impact of microbubbles on diver vitality and health.
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A comprehensive 'how to' guide to pony cylinder benefits, selection, gas planning and usage. Everything you need to know about pony cylinders.
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There are three governing factors which determine how deep can you dive using air. Understanding those factors promotes safe gas selection.
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Should you choose your BCD or drysuit for buoyancy control? Find out the advantages and disadvantages of each option in this article.
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Learn when to drop your weight belt to survive a scuba diving accident. Tips and advice on weight belts and technqiues.
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Did you know that mild CO2 retention (hypercapnia) causes acute CO2 narcosis symptoms when you are diving? Don't assume it is nitrogen!
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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?
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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…
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Learn how to overcome fear of mask removal when scuba diving with these expert tips. Improve your skills and confidence underwater.
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Understand the characteristics, benefits & drawbacks to scuba diving cylinders. This article helps you decide between steel & aluminum tanks.
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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…
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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…
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The Complement System and Diving by Dr. Ernest Campbell. The role of the immune response in sub-clinical DCS & decompression stress issues.
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Looking for the perfect scuba diving wetsuit? My buyer's guide for divers will help you learn about materials, sizes, features, care & more!
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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!
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Not all dive computer algorithms are created equal. Learn the differences and make an informed decision when buying your next dive computer.
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The best budget dive computers 2023. Get value for money by understanding the features & functions. Unbiased advice to help you choose!
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Discover the difference between tropical & cold water diving. Learn the right dive gear & techniques for safe, enjoyable diving experiences.
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Learn how to choose, deploy, and maintain surface marker buoys (SMBs) and delayed surface marker buoys (DSMBs) for safe scuba diving!
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Learn about Personal Locator Beacons (PLBs) for scuba diving. A divers guide to choosing, using, and maintaining a PLB for dive safety.
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Level up your scuba diving! A guide to emergency signaling devices: types, features, proper usage, and maintenance. Dive with reassurance!
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Discover blackwater diving with this ultimate guide! Learn about gear, safety, techniques, photography, marine life & best destinations.
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Explore the 10 best muck diving sites for macro photography in the world. Learn about capturing stunning underwater photos of rare critters!
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Muck diving underwater photography in Subic Bay, Philippines. Experience the rare marine life to be found in this photographer's paradise!
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An illustrated guide to getting the best out of your Shearwater dive computer settings. Don't be intimidated by the advanced display options!
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Make your air last longer when scuba diving by following these simply tips. Read the solution to end frustrattion of high gas consumption!
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Recreational diving limits become increasingly blurred with technical diving. Why are limits required & how do divers need to consider them?
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Three important tips on how to ascend when scuba diving. Read this to increase your safety and enjoy less fatigue after your dives!
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The best books for diving instructors to improve teaching ability & train better divers. None of this was taught in your dive pro courses!
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Divers often talk about diving experience. But what does that mean? Learn the difference between an experienced diver and an expert diver!
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An honest appraisal of the training given on recreational Deep Diver courses versus the risks that exist on deeper dives.
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Learn the best ascent speed for scuba diving. Contrary to assumptions, slower is not always safer when it comes to diving ascent rate!
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Do you feel tired after diving? Read this article to understand what REALLY causes post-dive fatigue & the simple steps needed to avoid it!
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Honest pro tips on how to buy the best scuba diving BCD for your needs. Learn about BCD features, functions, designs and suitability!
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This honest and impartial scuba diving regulator purchase guide will save you money. Avoid making costly mistakes when buying expensive dive gear.
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Deep diving risks are badly educated on many dive courses. This article is a comprehensive guide to the hazards of deeper recreational diving.
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What is the value of doing more diving courses after open water diver certification? It all depends finding a high quality course. Read how!
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Learn how heuristic thinking harms scuba diving risk management. Read this to safeguard against cognitive biases for safe & successful dives!
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Diving experience isn't the path to mastery. Read this to learn what is really necessary to develop expertise as a scuba diver!
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Deliberate practice is a methodology for the most efficient skill development. Learn how to fast-track your diving competency with this guide.
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A realistic examination of scuba diving stress management. What does it REALLY take for a diver to overcome panic when a dive goes wrong?
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Did you know that scuba diving anxiety can arise from CO2 narcosis? Learn why descent speed, gas density & exertion can affect your dives!
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This article has everything that you were never taught about scuba diving descent speed! What effects and issues does the descent rate have?
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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!
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How to develop your scuba diving trim and become a more comfortable, confident & competent diver. Follow these simple tips for swift progress!
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Learn the benefits of obtaining a scuba diving certification, including improved safety, access to more dive sites, & enhanced diving skills.
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How do scuba divers perceive nitrogen narcosis? Is it possible to gauge your susceptibility to narcosis & make sound judgments to manage it?
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Learn scuba gas planning for your dives! A step-by-step guide to gas management for divers. Enhance your dive knowledge & safety underwater!
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Honest expert pro tips to help prevent costly mistakes when buying your dive gear. Don't regret your scuba equipment purchases!
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Understand the potential risks of scuba diving and how to minimize them. Learn about the most common dangers and how to stay safe.
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When scuba equipment shopping it's easy to waste money on disappointing or inappropriate dive gear. These honest pro tip helps avoid costly mistakes!
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Stable diver trim is the foundation for good buoyancy control and efficient propulsion. It also helps conserve the marine environment.
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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.
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Maximize your diving potential with these 10 tips for new divers to rapidly improve confidence, comfort and competency on your dives!
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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.
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Scuba diving FAQs answered by an expert professional diver with 30 years of dive experience! Essential tips for safe & enjoyable dives!
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Discover 29 stunning UNESCO Marine World Heritage Sites for your diving bucket list. Awe-inspiring dives that promote marine conservation!
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Achieve effortless diving with these expert step-by-step tips. Master breathing, weighting, trim, & more. Use less gas & increase your safety!
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Lightweight diving fins that don't compromise on performance! Here is my pick of the best vacation travel scuba diving fins
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A comprehensive buying guide to the best watch sized diving computer. Explore the details & specifications to for the best informed decision!
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A new study on nitrogen narcosis challenges the long held presumption that nitrogen narcosis impairment dissipates immediately on ascent from depth.
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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…
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A bad dive buddy is stressful & dangerous. Follow this advice to develop a harmonious buddy system and boost your diving safety & enjoyment!
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Nitrogen narcosis sedation is diminished consciousness: not the alcohol-like intoxication many divers are taught.
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Divers often struggle with their buoyancy. These essential tips are game-changing to set you on the right path for consistent improvement.
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The three benefits of nitrox as a breathing gas for scuba diving. Is it worth the cost of training and more expensive cylinder fills?
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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
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Discover the importance of diving suits for underwater exploration. From material to design, learn about the key features to look for.
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This beginners guide has all the information you need for starting scuba diving & ensures you get the most out of your underwater experience!
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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.
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Examining the risks & personal factors that should be considered before attempting solo diving. Read this article before you dive alone!
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The Philippines is a diver's paradise, with an abundance of stunning and diverse marine life, vibrant coral reefs, shipwrecks and crystal-clear waters
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Don't pay good money for bad training. Undertanding these factors will help you identify the best scuba diving courses available.
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The ability to horizontal hover when scuba diving is the benchmark of fundamental skills proficiency. These tips will help you master hovering
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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…
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The benefits of streamlined dive gear and how to achieve it with your own scuba diving equipment. Small kit changes can have big effects.
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The balanced rig principle for diving describes a calculated approach to the amount of weight which can be jettisoned in an emergency
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How to improve your diving ascents & descents for safer and more comfortable scuba dives. This article can change your diving.
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How to control your breathing & scuba buoyancy for more comfort, confidence and competency as a scuba diver.
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How to perfect your scuba weighting. Get this right & your buoyancy control will be much easier. Advice not taught in Open Water courses
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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
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What are the buoyancy control benefits for scuba divers? The reasons why it is worth devoting time & effort to developing core diving skillset
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The benefits of improving scuba buoyancy control & how it can be developed in training & practice.
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The effect of micro bubbles when scuba diving. Sub-clinical DCS may not merit a medical emergency, but should be understood and respected.
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Scuba diving skills taught in a kneeling position cause a plethora of problems for divers. Training in neutral buoyancy is very important!
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A 'how to' guide for scuba diving skill development. A systematic tiered approach to ingraining fluent & intuitive dive proficiencies.
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DCS and the Immune System. How bubbles trigger an immune response that can make or break your body's fight against decompression sickness.
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Don't get gas mugged - The role of situational awareness in predicting and avoiding stressful air-sharing emergencies in scuba diving
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Are AI dive computers a valuable investment for divers? Honest pro advice on using transmitters with air integrated dive computers.
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Balanced Rig Principle: improve diving safety with a calculated approach to the overall buoyancy dynamic. Survive BCD failures without drama.
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Decompression sickness types and symptoms. There are 4 medical catagorizations of DCS, along with sub-clinical DCS, aka decompression stress.
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Using your hands when scuba diving is inefficient for maneuvering. Learn how to break this habit and become a better scuba diver.
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Being able to judge your diving ascent rate is an invaluable safety skill if your computer or bottom timer fails. These tips show how!
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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…
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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…
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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…
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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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