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25 feet adjustment advantages apparatus Arawak atmosphere breathing bags Breathing effort breathing system bubbles buoyancy calibrated canister chest circuit close CLOSED-CIRCUIT OXYGEN COMBINATION component constant conventional correct coupled cylinders Deck Decompression Chamber SDC demand regulator demand valves dense gas depth descend designed diameter diver diving double-demand unit economical ELECTRIC electronic linkage eliminates entire unit exertion exhalation factors fish Flexible flood valve foot gas flow gas mixtures gear handling highly HOOKAH hose HOSE-FED hour underwater Increasingly indicate inert interchangeable Krasberg chamber control light living quarters maintain mate meter Min-O-Lung mixed-gas Scubalung Model Navy open-circuit operate p02 control partial photography position pounds preset pressure variation problems produced prolonged submersion properly proportion rates regardless replenishment Respiratory effort rough SDC bell sensor shallow solve respiratory submersible decompression chamber supply SUPPORT EQUIPMENT surface switch tank Underseas underwater living unusual valuable varied vest weighs WESTINGHOUSE