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About: Underwater breathing apparatus     Goto   Sponge   NotDistinct   Permalink

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Underwater breathing apparatus is equipment which allows the user to breathe underwater. The three major categories of ambient pressure underwater breathing apparatus are: * Open circuit scuba, where the diver carries the gas supply, and exhaled gas is exhausted to the environment * Rebreather scuba, where the diver carries the gas supply, and exhaled gas is recycled for further use, and * Surface supplied diving equipment, where the gas supply is provided from the surface through a hose in a diver's umbilical Two other types may also be identified: