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Unlike different modes of diving, which rely both on breath-maintain or on respiration gas pumped from the floor , scuba divers carry their very own supply of breathing gas , usually compressed air , 2 allowing them better freedom of motion than with an air line or diver’s umbilical and longer underwater endurance than breath-hold. Scuba gear could also be open circuit , by which exhaled gas is expelled to the environment, or a closed or semi-closed circuit rebreather , in which the breathing gas is scrubbed to remove carbon dioxide , and the oxygen used is replenished from a provide of feed gasoline before being re-breathed.
Sir parliamentarian Davis, head of Siebe Gorman, formed the oxygen rebreather in 1910, along with his invention of the Davis Submerged Escape gear, the primary sensible rebreather to be created in quantity. Depth limits depend on the jurisdiction, and most scuba diving depths …
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