Scuba diving
Depth range

The depth range applicable to scuba diving depends on the application and training. Entry-level divers are expected to limit themselves to about 60 feet (18 m) to 20 metres (66 ft). The major worldwide recreational diver certification agencies consider 130 feet (40 m) to be the limit for recreational diving. British and European agencies, including BSAC and SAA, recommend a maximum depth of 50 metres (160 ft) Shallower limits are recommended for divers who are youthful, inexperienced, or who have not taken training for deep dives. Technical diving extends these depth limits through changes to training, equipment, and the gas mix used. The maximum depth considered safe is controversial and varies among agencies and instructors, however, there are programs that train divers for dives to 120 metres (390 ft).

Professional diving usually limits the allowed planned decompression depending on the code of practice, operational directives, or statutory restrictions. Depth limits depend on the jurisdiction, and maximum depths allowed range from 30 metres (100 ft) to more than 50 metres (160 ft), depending on the breathing gas used and the availability of a decompression chamber nearby or on site. Commercial diving using scuba is generally restricted for reasons of occupational health and safety. Surface supplied diving allows better control of the operation and eliminates or significantly reduces the risks of loss of breathing gas supply and losing the diver. Scientific and media diving applications may be exempted from commercial diving constraints, based on acceptable codes of practice and a self-regulatory system.
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