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25 minutes 60 feet Adjusted Maximum Dive air embolism AMDT become boat body Boyle's Law breathing bubbles cause Chapter decompression sickness decompression stop defensive diving depth dive computer dive partner dive planning dive tables Dive Time Calculator Dive Time Limits emergency ascent End-of-Dive letter group equipment exhaling feet 18 Figure fins gauge gear hand signals hose inflate the B.C.D. instructor ISBN J-valve letter group designation List three lungs mask moray eels NAUI Dive Tables night diving nitrogen narcosis no-decompression octopus out-of-air oxygen panic Paperback performance pony bottle prevent problem psi/min regulator relaxation repetitive dives rescue rescuer residual nitrogen resuscitation REVIEW QUESTIONS ANSWERS safety scuba diving scuba tank second stage sharks snorkel Spare Air sport divers squeeze straps stress student surface interval swimming symptoms techniques tissues underwater underwater diving victim waves weight belt wet suit worksheet