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  2. Deep diving - Wikipedia

    en.wikipedia.org/wiki/Deep_diving

    Depth limit for a French level 2 diver accompanied by an instructor (level 4 diver), breathing air. [citation needed] 50 m (160 ft) Depth limit for divers breathing air specified by the British Sub-Aqua Club and Sub-Aqua Association. [16] 60 m (200 ft) Depth limit for a group of 2 to 3 French Level 3 recreational divers, breathing air. [17] 66 ...

  3. Dive profile - Wikipedia

    en.wikipedia.org/wiki/Dive_profile

    An analysis of dive profiles logged by dive computers by the Divers Alert Network used categorization rules which were based on the fraction of the dive time spent in four depth zones: descent, bottom, multilevel, and decompression. The descent zone was defined as the part of the dive between the surface and first reaching 85% of the maximum depth.

  4. Ratio decompression - Wikipedia

    en.wikipedia.org/wiki/Ratio_decompression

    A conventional decompression profile, based on a dissolved gas model algorithm, will result in a diver ascending relatively quickly through shorter deep stops before spending a great deal of time at the shallower stops (resulting in a much sharper angle in the depth/time graph of the ascent profile), ratio deco will allow a diver to dynamically ...

  5. Decompression practice - Wikipedia

    en.wikipedia.org/wiki/Decompression_practice

    A personal dive computer is a small computer designed to be worn by a diver during a dive, with a pressure sensor and an electronic timer mounted in a waterproof and pressure resistant housing which has been programmed to model the inert gas loading of the diver's tissues in real time during a dive. [82]

  6. Maximum operating depth - Wikipedia

    en.wikipedia.org/wiki/Maximum_operating_depth

    So the 1 atmosphere or bar contributed by the air is subtracted to give the pressure due to the depth of water. The pressure produced by depth in water, is converted to pressure in feet sea water (fsw) or metres sea water (msw) by multiplying with the appropriate conversion factor, 33 fsw per atm, or 10 msw per bar. In feet

  7. Underwater diving - Wikipedia

    en.wikipedia.org/wiki/Underwater_diving

    The recommended depth limit for more extensively trained recreational divers ranges from 30 metres (98 ft) for PADI divers, [122] (this is the depth at which nitrogen narcosis symptoms generally begin to be noticeable in adults), to 40 metres (130 ft) specified by Recreational Scuba Training Council, [122] 50 metres (160 ft) for divers of the ...

  8. Recreational scuba certification levels - Wikipedia

    en.wikipedia.org/wiki/Recreational_scuba...

    CMAS** scuba diver is a certification for recreational scuba diving issued by the Confédération Mondiale des Activités Subaquatiques (CMAS). which indicate that the diver has been found competent to dive in open water to a maximum depth of 40 meters, accompanied by another diver with equivalent or higher certification, with no dive leader ...

  9. Recreational diving - Wikipedia

    en.wikipedia.org/wiki/Recreational_diving

    Depth limitations are imposed by the certification agencies, and relate to the competency associated with the specific certification. Entry level divers may be restricted to a depth of 18 or 20 metres (59 or 66 ft), and more advanced divers to 30, 40, 50 or 60 m depending on the certification and agency.