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Tag Archive: gas


Sidemount Technical Wreck Diving Subic Bay Philippines

Choosing and Using A Redundant Air Source By Andy Davis Pony cylinders are a popular choice amongst divers who seek a redundant form of air supply as a contingency for Out-Of-Air (OOA) emergencies when scuba diving. There is a lot of debate about when, or if, a recreational open-water diver should need a redundant air […]

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, […]

scuba-tips-advice-how-to-professional

Scuba Q and A: How Deep Can You Dive Using Air? Q. How deep can someone scuba dive using normal air? Answer:  There are a number of factors that determine the Maximum Operating Depth (MOD) of any gas mixture. These include: Inert-Gas Narcosis Inert gas narcosis using air begins to become debilitating through anaesthetic effect […]

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 Wreck Diving Subic Bay Philippines

Decompression Gases – Efficiency Ratios Deco Gas Efficiency Ratio Air 1:1 32% 1:1.6 36% 1:1.21 40% 1:1.26 50% 1:1.32 80% 1:1.36 100% 1:1.40 Theoretical efficiency ratios for decompression gas options.