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THE SAFE DIVER e
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33 feet abalone absolute pressure air embolism air supply air tank arms ascent atmosphere basic beach become blood boat body bottom bubbles buoyancy compensator buoyancy compensator vest carbon dioxide cause cave diving chest compass cylinder decompression sickness decompression stops Decompression Table deep dives deeper depth gauge descend diving cylinder eardrum enter the water entry equipment Eustachian tube exhale exit face mask feel fish float flotation vest gases gear hand head high-pressure hold hose inches increasing inflate inhalation instructor keep kelp kick knees legs lungs marine minutes mouth mouthpiece nitrogen nitrogen narcosis no-decompression nose oxygen pints pounds previous dive pull regulator repetitive dive rocks scuba diver scuba tank shallow shark side skills skin diver snorkel spear sport diver squeeze stay strap submerged sure surface interval tank valve tissues tube U.S. Navy underwater world volume waves wearing weight belt wet suit