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Tag Archive: technical


Deep Diving Maladies – Compression Arthralgia by Andy Davis Compression Arthralgia (also called compression pains)  can onset as shallow as 60m/200ft but becomes more significant as depth/pressure increases.The severity of compression arthralgia is determined by the speed of descent (rate of compression), depth attained (significance of compression) and the level of diver exertion or activity. […]

OXYGEN EXPOSURE MANAGEMENT by Richard D. Vann Oxygen metabolism is the primary energy source in higher life forms, but when oxygen enters the metabolic process prematurely, reactive oxygen species can form which interfere with normal function and cause convulsions or other symptoms of oxygen toxicity. Immersion, exercise, and inspired carbon dioxide increase susceptibility to oxygen […]

decompression theory technical diving

Decompression Theory – Links and Resources Here is my selection of educational articles and resources for further reading on scuba diving decompression theory… –  Bubble Decompression Strategies by Eric Maiken –  VPM Decompression Site by Eric Maiken –  Confessions of a Mortal Diver by Richard Pyle –  The Importance of Deep Stops by Richard Pyle –  Half-Times Explained by Mark Powell –  Deco Lessons by Erik Baker (pdf) […]

Technical Diving Skills – Valve Shutdown Drill Explained This article, posted at Dive DIR, provides a very clear explanation of valve shutdown drills for isolated manifold doubles/twinset cylinders. Great reading, if you are thinking about technical diving or just doing recreational scuba dives with doubles cylinders. A sample: Tuesday, 02 November 2010 17:39 This article […]

technical-diving-philippines-subic bay courses instructor lessons

Prepare Yourself For Technical Diving by Andy Davis Technical diving is increasingly becoming more mainstream as a diving activity; that is a good thing. Many more divers are now opting to pursue tech training as a means to increase the range of their potential diving and enjoy new experiences in their favourite hobby. However, many […]

technical diving optimal gas mixes

Technical Diving – Optimal Gas Mixes Knowledge of optimal gas mix selection is critical to the technical diver.  The graph below simply correlates bottom depth against a desired END, and is consistent  with the tech community standard of 1.4PP02 for the working phase of the dive. The chart does not substitute for accurate technical dive […]

sidemount technical diving training course subic bay

Goal Setting for Technical Diving Training by  Andy Davis Technical diving is a serious endeavour, that requires a significant commitment in respect of money, time and effort.  For that reason, very few divers embark on technical diving training without having some sort of plan of what they wish to achieve in the long-term. Setting long-term […]

technical-diving-formulas

Technical Diving Formulas The scanned page below highlights key formulas for technical diving.  This is useful as a review, or for technical diving students preparing for courses. Originally posted 2018-03-07 23:56:54.

technical diving subic bay philipines

Confessions of a Mortal Diver – Learning the Hard Way (Decompression Sickness, Treatment and Recovery) by Richard L. Pyle (deepreef@bishop.bishop.hawaii.org) ScubaTechPhilippines note:  I’ve posted this article as it represents a serious lesson and learning text for technical divers.  It was originally posted via a washington.edu website, but sadly that location hasn’t remained online. The true story, […]

Gradient Factor Comparison Using A Simple 60m Trimix Dive Case-Study By Andy Davis. As a follow-up to my previous article, ‘A Logical Application of Gradient Factors Settings for Open-Circuit Tech Divers‘, I have decided to write a comparative case-study that illustrates the effect that three different gradient factor settings can have on the dynamics of […]

The Changing Tech Community Landscape by Andy Davis. Having been actively involved in technical diving for over 15-years as both a diver and instructor, people sometimes ask me how things have changed since I first ‘went to the dark side’. There have been many changes; the equipment and technology used, the understanding of decompression and […]

Scuba Diving Philippines

Are You Ready For Solo Diving? by Andy Davis The issue of solo diving often comes up in conversation amongst divers and the activity is increasingly being seen as a more ‘mainstream’ pursuit, now supported through formalized training courses and qualification by most of the primary scuba training agencies. As a technical diving instructor, I […]

Sidemount Technical Wreck Diving Subic Bay Philippines

Pony Cylinders and Redundant Air Sources for Wreck Diving by Andy Davis Recreational wreck divers often question whether they need to carry a redundant source of air when conducting specialist wreck diving activities.  Most agencies and instructors will generally recommend the use of redundant air sources to be a prudent measure for wreck divers.  However, […]

Technical versus Recreational Scuba Diving:  Why is there a need for Rules, Boundaries and Limitations? There is currently a strong debate about the need to differentiate between recreational and technical scuba diving. Some people believe that ‘diving is diving’ and question the need to draw a distinct boundary between recreational and technical diving pursuits. In […]

sidemount-technical-wreck-courses-philippines

A Guide to Modern Sidemount Diving by Andy Davis 1. What is and isn’t Sidemount Diving? Sidemount Diving Sidemount diving is the, now increasingly formalized, approach towards conducting dives with 2 or more primary cylinders secured at the side of the body and in line with the torso – with no cylinders on the diver’s […]

best ascent speed for scuba diving

Best Ascent Speed for Scuba Diving by Andy Davis Disclaimer: The opinions expressed in this article are those of the author, and they do not reflect in any way those of the dive training agencies to which he is affiliated. Information presented in this article is not intended to advocate breaching the Safe Diving Practices taught […]

scuba-tips-advice-how-to-professional

Scuba Q and A: Why Do Decompression Divers Use Nitrox? Q. Why do decompression divers need to use nitrox in the shallower part of their dive? Answer: A diver absorbs or releases inert gas based on the positive or negative partial pressure differential of those gases in their breathing mix and body tissues. We only […]

technical diving subic bay philipines

Technical Diving Skills – Reaching Your Valves This article, posted at DiveDIR, gives great advice on how to reach your valves when conducting valve shutdown procedures.  It’s the most comprehensive analysis of this key skill attribute that I’ve read to date.  They call it the ‘ultimate guide’… it really is! Direct Link: http://www.divedir.com/Drills-and-Skills/valve-drills-the-ultimate-guide.html Sample: Reaching Your […]

technical diving subic bay philipines

Using Your Hands Whilst Scuba Diving by Andy Davis Many novice divers wish to improve their air consumption during dives and increase their relaxation and fluidity underwater.  A major obstacle to these goals is using your hands for control and/or propulsion I think that most novice divers have an instinctive tendency to try and ‘swim’ […]

technical wreck penetration training course

Technical Wreck Penetration – A Question Of Experience by Andy Davis I often get asked how many dives should a technical wreck diver have before they undertake serious wreck penetration dives at depth. It’s  hard to answer, because it is a very individual question; which deserves more than a simple numerical answer. I can dive […]

TDC-3 technical diving computer

The Best Technical Diving Computers 2019 by Andy Davis Here’s my list of the best open circuit technical diving computers on the market in 2019. Note: I am only including ‘true’ technical diving computers; because there are some awful impostors on the market nowadays.  Manufacturers may simply boast that a computer offers multiple gasses and/or […]

Raid sidemount technical advanced wreck course Philippines

Sidemount Diving  Technical Wreck in Subic Bay, Philippines. Just a few pics from today’s dives on the wrecks in Subic.. Diver: Andy Davis, tec instructor, Scuba Tech Philippines Photos courtesy of Jun Lao, PaparazSea Images.   Diving Logistics: Arizona Dive Center          For details about my specialist wreck diving courses, please see: […]

Sidemount Technical Wreck Diving Subic Bay Philippines

Advanced Recreational Wreck Diving, Subic Bay, Philippines   Going beyond a standard ‘Wreck Diver’ course and exploring the full range of training and equipment available to recreational divers who seek to dive safely and confidently in a wreck environment. This video was taken during an ‘Advanced Recreational Wreck’ workshop in Subic Bay, over 4 days […]

Sidemount Technical Wreck – Teaser Video A short (4 minute) HQ video showing highlights of the sidemount technical wreck exploration and training dives in Subic Bay, Philippines.  ANDI, PADI and skills clinic training and videography by Andy Davis (PADI MSDT 634077) and Bruce Konefe (ANDI I.T.D. #15). Dives filmed on (in): the USS New York, […]

xdeep nx project wing review andy davis

 Review: XDeep NX Project Wing  by Andy Davis  Shortly before Christmas 2016, I received the new XDeep NX Project technical wing for testing and review.  Over the following months, I subjected the wing to a range of demanding technical and advanced wreck penetration diving here in the Philippines.  This is my review of the XDeep […]

Technical Wreck Sidemount Equipment Primer 1

Technical Wreck Sidemount Equipment Primer eBook For Students I’ve written an equipment ‘primer’ that will be available free to all of my sidemount, technical and wreck students. The aim of this eBook is to provide advice and guidance on equipment selection and preparation, in advance of training. The eBook covers all elements of  wreck, technical […]

how to prepare for technical diving training 1

Ten Tips On How to Prepare for Technical Diving Training By Andy Davis I teach a wide range of technical diving courses, including deep diving decompression, technical wreck penetration and advanced overhead environment sidemount training. Of all those diverse and challenging courses, the one I see students struggle the most with is entry-level tech; their […]

homemade diy sidemount rig harness system

Some Options for Homemade / DIY Sidemount Rigs I use several homemade / DIY sidemount configurations frequently when wreck diving in the Philippines.  These sidemount configurations are exceptionally economic – costing significantly less than ‘off-the-shelf’ purchased rigs. The majority of components can be bought ‘over-the-counter’ at a reasonably well stocked dive shop, and/or make use […]

What It’s Like To Be… A Technical Diving Instructor by Andy Davis I was recently interviewed by preaquaint.com on my career as a technical diving instructor.  That interview has been published on their website and might prove interesting for those who are considering teaching technical diving or have a general interest in the tech diving community […]

New Sidemount Diving Philippines Trailer Not for those with a nervous disposition – sidemount diving Philippines….

Diving the Showa L2D ‘Tabby’ Wreck – Subic Bay, Philippines  This week I took several newly graduated technical divers onto an unidentified aircraft wreck in Subic Bay.  Within a short time of descending on the first dive, it seemed very likely that the wreck was some variant of a C-47 Skytrain (DC-3 Dakota). The wreck lies […]

M-bungee-sidemount rig

‘M Bungee’ Super-Minimalist Sidemount Rig I had some spare time the other afternoon, so I took the opportunity to test-dive a concept I’ve had brewing for a while.  Basically, it is a harness-less sidemount rig, using an ‘M’ shape continuous bungee to secure the upper wing whilst providing traditional mounting points for sidemount cylinder valves.  The wing […]

PADI Sidemount Diver Course   – Promo Teaser Video Sidemount Diving is a ground-breaking new approach for streamlined, convenient & safe diving, at both recreational and technical levels.  It is time that you learned more about the fastest-growing revolution in scuba diving… Sidemount training provides a structured approach for recreational and technical divers who wish […]

Wreck Diving – Guidelines Technique Tutorial Videos These two videos from Mark Blackwood provide a good insight into effective guideline techniques for guideline laying in wrecks. More details of guideline techniques for wreck diving can be found in my Advanced Wreck Diving techniques supplement.  For details about my specialist wreck diving courses, please see: PADI […]

Sidemount Technical Wreck Diving Subic Bay Philippines

TecRec Technical Diving Log Book Page Insert Click on the link below to open a PDF copy of the TecRec log-book insert.  Save and print… hey presto!…. you can now log your technical dives! TecRec Technical Diving Log Book Insert

Sidemount Technical Wreck Diving Subic Bay Philippines

ANDI Ascent & Descent Procedures – Open Circuit Diving During all ANDI training courses, students are taught to follow a set system of procedures for ascent and descent.  These procedures include a number of stops, to enable team cohesion, increase safety and conservative off-gassing. You don’t need to be an ANDI trained diver to appreciate […]