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air hose air supply ambient pressure apparatus ascent atmosphere barotraumatic gas embolism bars blood body bottom breathing bag(s breathing hose breathing medium buddy buoyancy carbon dioxide closed-circuit SCUBA compression compressor decompression procedure decompression schedule decompression sickness decompression stop Decompression Table deep diving deep-sea diving outfit demand regulator descent disinfection diving system dry suit emergency equipment excursion dives exhalation exhaust valve exposure Figure filter gas embolism gas mixture gases helium helmet high-pressure hypoxia in-water increase inhalation loss of consciousness lungs mask meters depth minutes mixed gas mixed-gas necessary nitrogen nitrogen narcosis no-decompression dive normal open-circuit SCUBA operations partial pressure prevent problem recompression chamber recompression treatment repetitive dive resuscitation SAFE DIVING saturation diving SCUBA cylinders SCUBA diving semi-closed sion snorkel squeeze standard standby diver submarine surface swimfins symptoms tion tissues toxic U.S. Navy underwater victim volume weeverfish