How 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!
Andy Davis Sidemount Technical Wreck Diving Blog
Articles for beginner to expert scuba divers
Andy Davis Sidemount Technical Wreck Diving Blog
Articles for beginner to expert scuba divers
Scuba Diving
Read MoreHow to Judge Your Diving Ascent Rate Without a Dive Computer
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.
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.
How 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.
How 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.
Using 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.
When 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.
CO2 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!
Changing 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?
The 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.
Scuba Diving Cylinders: Steel or Aluminium?
Understand the characteristics, benefits & drawbacks to scuba diving cylinders. This article helps you decide between steel & aluminum tanks.
Sheck Exley’s Razor – The Nature of Diving Limits
A re-published article discussing Sheck Exley's 'Razor' and the consideration of limits for overhead environment and technical divers.
Nudibranch in Anilao Nudibranch – Philippines Underwater Photography
Anilao nudibranch: Philippines underwater photography from one of the prime muck and macro dive locations in the world.
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.
The 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!
Risk 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!
Dive into Fun: A Parent’s Guide to Youth Scuba Diving for Kids
Discover the joy of youth scuba diving for kids. A parent's guide to safe and thrilling underwater adventures for children and young adults!
A 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.
Drysuit Gloves: An Ultimate Divers Guide To Dry Glove Systems
Everything about drysuit gloves! Dry glove materials, seal systems & thermal inners. Uncover the secrets to a comfortable cold water dive!
Tropical 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.
A 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!
A 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.
The Passion for Scuba Diving: Dopamine Hits vs. Serotonin Satisfaction
Learn how dopamine & serotonin reward mechanisms shape our enjoyment of scuba diving; impacting diver safety, proficiency & active participation.
The 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!
The Ultimate Guide to Blackwater Diving
Discover blackwater diving with this ultimate guide! Learn about gear, safety, techniques, photography, marine life & best destinations.
The 10 Best Muck Diving & Macro Photography Sites in the World
Explore the 10 best muck diving sites for macro photography in the world.
Muck 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!
Shearwater 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!
How 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 frustration of high gas consumption!
Recreational 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?
How 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!
Top-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!
What 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!
Deep 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.
Why Do Divers Use Helium?
Find out the three reasons why divers use helium in their breathing gas to increase diving safety. Scuba agencies have differing policies on training for helium diving.
What is the Best Technical Diving Computer? | 2025
My review of the best technical diving computer available in 2025. All the specifications and critique you need to make an informed decision!
The Ultimate Guide to Full Face Masks: FFM for Scuba Divers
Learn everything you need to know about diving with Full Face Masks (FFM) in this very comprehensive diver guide. Buyer's advice and pro tips!
Technical Diving: Redundant Computers vs Backup Timer & Tables
Discover the pros & cons of redundant computers versus backup bottom timers & tables in technical diving. Which option is best for you?
Scuba 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!
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.