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FOREWORD This on
The history of diving
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33 feet 60 feet abalone ability air embolism areas ascent atmosphere attack beach blood body bottom breathing bubbles buddy buoyancy Calif camera carbon dioxide cause Check chest color cylinder dangerous decompression sickness decompression stops Decompression Table deep depth diving equipment dry suit eardrum effect enter Eustachian tube exhale experienced diver face mask face plate feet per minute fins fish float gases hazardous hose inch increased injury kelp lungs marine middle ear moray eel mouth mouthpiece nitrogen normal nose oxygen pain percent physical poison pres present pressure rebreather recommended recompression chamber regulator Repetitive Dive repetitive group designation respiration respiratory Reversal Daylight rip current rocks rubber rupture safety scuba diving shark shell sinus sinuses skin divers skin-diving snorkel spear gun spines sport divers squeeze sting strap sure surf surface interval symptoms tank tion tissue treasure Underwater Photography unit valve waves weight belt wound