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Advanced Diver training air supply ambient pressure anemones animals ascent atmosphere Barotrauma beach become blood boat body Bourdon breathing buddy buoyancy compensator carbon dioxide cause cave diving Cnidaria cold water colour compass compressed coral reefs course cylinder valve dangerous decompression sickness decompression stop demand valve depth gauge developed dive patterns dive tables Divemaster diving cylinder Diving Instructor dry suit eggs ensure equipment exhaled fins fish flow hard corals hose important increases inflate jellyfish known lungs marine environment marine organisms mask ment mouth narcosis navigation neutral buoyancy nitrogen nitrogen narcosis normally occur octopus oxygen patient phylum polyps prey reduce regulator respiration result rip current rock Scuba cylinder Scuba diving sea snake sea's shallow sharks shore snorkel species spines stinging surface swim tank temperature tentacles tide tion tissue tube turtles underwater world vary venom victim volume wave weight wet suit zooxanthellae