Self Contained Underwater Breathing Apparatus. The term SCUBA in common usage usually means open-circuit equipment in which gas (usually air) is breathed from a cylinder of compressed gas and then exhaled into the water, usually in the line of kit development started by Emile Gagnan and Jacques-Yves Cousteau. However, rebreathers (both semi-closed circuit and closed circuit) are also self-contained systems (as opposed to surface-supplied systems) and could be classed as SCUBA.

Scuba Diving Encyclopedia

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