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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 ...
An overhead or penetration diving environment is where the diver enters a space from which there is no direct, purely vertical ascent to the safety of breathable atmosphere at the surface. Cave diving, wreck diving, ice diving and diving inside other natural or artificial underwater structures or enclosures are examples.