Scuba diving: Difference between revisions

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, not to be confused as goggles, [[diving suit|exposure protection]], equipment to [[buoyancy control device|control buoyancy]], and equipment related to the specific circumstances and purpose of the dive. Scuba divers are trained in the procedures and [[Scuba skills|skills]] appropriate to their level of certification by instructors affiliated to the [[List of diver certification organizations|diver certification organisations]] which issue these certifications. These include standard operating procedures for using the equipment and dealing with the general hazards of the underwater environment, and emergency procedures for self-help and assistance of a similarly equipped diver experiencing problems. A [[Fitness to dive|minimum level of fitness and health]] is required by most training organisations, but a higher level of fitness may be appropriate for some applications.