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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   Water attenuates light by absorption, so use of a dive light will improve a diver's underwater vision at depth. [1] As the depth increases, more light is absorbed by the water. Color absorption depends on the purity of the water - pure water is most transparent to blue frequencies, but impurities may reduce this significantly.

3. Diver propulsion vehicle - Wikipedia

   en.wikipedia.org/wiki/Diver_propulsion_vehicle

   hobbyist-built DPV with T500 thrusters . A DPV usually consists of a pressure-resistant watertight casing containing an underwater thruster, or a battery-powered electric motor, which drives a propeller The design must ensure that the propeller cannot harm the diver, diving equipment or marine life, the vehicle cannot be accidentally started or run away from the diver, and it remains ...

4. Greater Underwater Propulsion Power Program - Wikipedia

   en.wikipedia.org/wiki/Greater_Underwater...

   Lighting and other "hotel" electrical loads were converted to use 120 volt 60 hertz alternating current, and ship electronics to use 120 volt 400 hertz AC. A new air conditioning system of greatly increased capacity was also installed. In service, these boats offered greatly improved underwater performance.

5. Index of underwater diving: A–C - Wikipedia

   en.wikipedia.org/wiki/Index_of_underwater_diving...

   Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater ...

6. Glossary of underwater diving terminology: A–C - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_underwater...

   canister light. See: Dive light#Canister light. Dive light comprising a light head connected to a battery canister by a cable. [46] canoe diving. Main article: Canoe diving. Scuba diving from canoes, used when the dive site is beyond convenient swimming distances. carbon dioxide poisoning. Main article: Carbon dioxide poisoning

7. Glossary of underwater diving terminology: H–O - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_underwater...

   This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in other contexts. Underwater diving can be described as a human activity – intentional, purposive, conscious and subjectively meaningful sequence of ...