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Scuba diving is a form of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater.[1] Scuba divers carry their own source of breathing gas, usually compressed air,[2] allowing them greater independence and freedom of movement than ...
Scuba diving is permitted by OSHA regulations to those depths under limited conditions. From 200 to 300 feet, diving rigs using helium and oxygen as a breathing medium are used. To 300 feet, diving is usually performed on a similar mixed gas system, except descents and ascents are done in a bell.