Category: Tech Course Pre-Reading


subclinical dcs decompression stress

Subclinical DCS, Decompression Stress and Post-Dive Fatigue by Andy Davis Post-Dive fatigue, malaise, lethargy, sleepiness and decreased vitality  is an often-observed consequence of scuba diving.  Many divers can relate with this; having felt sluggish and in dire need of  a snooze during surface intervals or after diving.  Is it really normal and expected? Is it […]

VPM varying permeability model

VPM For Dummies The Varying Permeability Model (VPM) for Dummies By Kevin Watts   Blog editorial:  I reproduced this article, for wider dissemination, from it’s original location at RebreatherWorld forum This article attempts to provide a basic framework for looking at the VPM. My hope is that a diver who may be intimidated or frustrated […]

Deep Diving Maladies – High Pressure Nervous Syndrome by Andy Davis HPNS or High Pressure Nervous Syndrome (also called High Pressure Neurological Syndrome)  can onset beyond a depth of 150m/500ft when using heliox or  trimix breathing gasses. The severity of High Pressure Nervous Syndrome is determined by the speed of descent (rate of compression), depth […]

nitrogen-narcosis-symtoms-signs

Nitrogen Narcosis – Perceptions of Susceptibility Examining the human factors influencing diver perceptions of susceptibility to nitrogen narcosis.  By Andy Davis Nitrogen narcosis is a hyperbaric neurological phenomenon. Its existence, symptoms and onset are known, even if medical science has not yet explained the physiological mechanisms causing it. Individual susceptibility to  the effects  of nitrogen […]

Sidemount Technical Wreck Diving Subic Bay Philippines

Under The Influence: A Performance Guide To Managing Narcosis By Barry Fowler, Ph.D.* This paper was originally prepared for habitat divers using nitrogen-oxygen mixes, where narcosis becomes a key limiting factor to performance. – Ed. Breathing hyperbaric air causes a syndrome of behavioral and subjective effects called nitrogen narcosis, which limits the work efficiency of divers and […]

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; and 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 favorite hobby. However, […]

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. […]

Scuba Diving Tips for Beginners

 DCS and the Immune Response The Complement System and Diving    by Dr. Ernest Campbell FACS [Blog note:  I reproduced this article from ScubaDoc, as I thought it valuable for understanding the wider implications of  sub-clinical DCS, especially the issue of ‘post-dive fatigue’ that indicates unhealthy decompression stress. This article ‘The Complement System and Diving’ […]

oxygen toxicity symptoms

DAN discusses the dangers of oxygen toxicity when using nitrox as a breathing gas. By Dr. E.D. Thalmann, DAN Assistant Medical Director; Captain, Medical Corps, U.S. Navy (retired) It’s a fact: we need oxygen to live. It’s because of the way our cells use oxygen that we are able to breathe, exercise, and even think. […]

Erik Baker Deep Stops 1

Clearing Up The Confusion About Deep Stops By Erik C. Baker The old adage, “an ounce of prevention is worth a pound of cure”, is certainly applicable to the various symptoms of decompression sickness (DCS). The best treatment of all for these maladies is to complete a sufficient decompression profile in the first place. Technical divers […]

Understanding M-Values By Erik C. Baker In conjunction with an array of hypothetical “tissue” compartments, gas loading calculations and M-values compose the major elements of the dissolved gas or “Haldanian” decompression model. Through the use of widely-available desktop computer programs, technical divers rely on this model for their decompression safety. A good understanding of M-values can […]

gradient factors buhlmann decompression

Gradient Factors – A Simplified Primer   I am sharing this excellent article by ‘Doppler’ as it really covers the essentials of understanding Gradient Factors in modern Buhlmann decompression algorithms.  In conjunction with Eric Baker’s ”Understanding M-Values’, this forms essential reading for any advanced diver seeking to utilize Buhlmann GF on their dive planning software, […]

doc deep garman fatal world depth record attempt scuba diving accident

A Fatal Attempt: Dr Guy Garman’s World Depth Record 2015 Analyzing The Psychological Factors That Can Lead A Team Into A Destructive Goal Pursuit.  On the 15th August 2015, the technical diving community received sad news that the latest World Depth Record attempt, to 1200ft/365m) had ended in tragedy when the participant, Dr Guy Garman, […]

gradient factors

Gradient Factors by Matti Anttila Ph.d Remember your first diving classes and the lesson about bubbling soda bottle and too rapid ascents? No matter how deeply you study the decompression theory, this soda bubble analogy is still valid. However, it’s time to introduce some more fundamentals of the issue. But let’s start from the history: […]

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.

Technical Diving Theory Sidemount Diving

Gradient Factors for Dummies By Kevin Watts (Article from RebreatherWorld.Com) This article attempts to provide a user’s view of gradient factors, an Erik Baker derived method of calculating decompression schedules. The title is not meant to be derisive, but simply an indicator that this article is meant to be a primer. Back to Buhlmann Everything […]

technical diving subic bay philipines

An abridged version of this deep stops article was originally in DeepTech, 5:64; and the full version subsequently published in Cave Diving Group Newsletter, 121:2-5. The Importance of Deep Stops: Rethinking Ascent Patterns From Decompression Dives by Richard L. Pyle Before I begin, let’s make something perfectly clear: I am a fish-nerd (i.e., an ichthyologist). […]

Sidemount Technical Wreck Diving Subic Bay Philippines

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 […]