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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 ...
The fundamental item of diving equipment used by divers is underwater breathing apparatus, such as scuba equipment, and surface supplied diving equipment, but there are other important pieces of equipment that make diving safer, more convenient or more efficient. Rebreather, closed-circuit or semi-closed-circuit scuba. 2  Free diving or breathhold diving, where the diver completes the dive on a single breath of air taken at the surface before the dive. 3  Snorkel allows breathing at the surface with the face submerged, and is used as an adjunct to free diving and scuba.