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Scuba diving may be done [[Recreational diving|recreationally]] or [[Professional diving|professionally]] in a number of applications, including scientific, military and public safety roles, but most commercial diving uses surface-supplied diving equipment when this is practicable. Scuba divers engaged in armed forces covert operations may be referred to as [[frogmen]], combat divers or attack swimmers.<ref name="Welham 1999" />
A scuba diver primarily moves underwater by using [[Swimfin|fins]] attached to the feet, but external propulsion can be provided by a [[diver propulsion vehicle]], or a sled pulled from the surface. Other equipment includes a [[dive mask|mask]] to improve underwater vision
==History==
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