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lntroduction Are the risks so great?
The Physical Environment
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40 metres air diving air or nitrox allow appropriate ascent avoid boat body breathing gas buoy buoyancy compensator casualty cave diving damage dangerous decom decompression line decompression sickness decompression stops decompression tables deep diving degree depth developed dive plan diver drysuit EANx effects emergency equipment exposure extremely full-face mask gas consumption gas mixtures gas switches gases gauges guideline heliox helium his/her hose in-water keep limits line reel lt's ment metres minutes mixed gas neoprene nitrogen narcosis nitrox mixture overhead environment oxygen toxicity partial pressure possible potential PPO2 pression problems pure oxygen reach rebreather recompression chamber recreational diving reduce redundancy regulator safe safer scooter SCUBA shallow simply sport diving stage cylinders stay stress suit inflation sure surface swim symptoms technical diving temperature therapy thermal tissues trimix underwater warm wetsuit wreck