Literally, Scuba diving means using diving underwater using Self Contained Underwater Breathing Apparatus.
Conventional scuba equipment usually consists of a cylinder of compressed air (worn on the diver's back), and a "regulator" which converts the air from being highly compressed and delivers it to the diver at a breathable pressure.
Scuba equipement also technically include rebreathers, which are a much more sophisticated form of diving equipment, whereby the air which the diver breathes is constantly recycled through a carbon dioxide scrubbing system.
Scuba diving is now a popular recreational holiday activity, with over 10 million certified scuba divers worldwide.
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