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Another type of small independent air source is a hand-held cylinder filled with about 85 litres (3.0 cu ft) of free air with a diving regulator directly attached, such as the Spare Air. [64] This source provides only a few breaths of gas at depth and is most suitable as a shallow water bailout.
Scubapro – Brand of scuba diving equipment – Scuba regulators, fins, lights, dive computers, Seacraft (DPV brand), also known as Marine Tech S.A. – Polish manufacturer of diver propulsion vehicles. [119] Seac Sub Italian manufacturer of diving equipment for scuba, freediving, spearfishing and snorkelling. [120] Seadive – (See Oceanways ...
Underwater breathing apparatus can be classified as open circuit, semi-closed circuit, (including gas extenders) or closed circuit (including reclaim systems), based on whether any of the exhaled gas is recycled, and as self-contained or remotely supplied (usually surface-supplied, but also possibly from a lock-out submersible or an underwater habitat), depending on where the source of the ...
It can run as an ordinary diving rebreather. Or it can be run with one of its two absorbent canisters filled with potassium superoxide, which gives off oxygen as it absorbs carbon dioxide: 4KO 2 + 2CO 2 = 2K 2 CO 3 + 3O 2; in this mode the oxygen cylinder is a bailout, or to fill and flush the circuit at the start of the dive. [1]
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Hydrox, a gas mixture of hydrogen and oxygen, is occasionally used as an experimental breathing gas in very deep diving. [ 1 ] [ 2 ] It allows divers to descend several hundred metres. [ 3 ] [ 4 ] [ 5 ] Hydrox has been used experimentally in surface supplied, saturation, and scuba diving, both on open circuit and with closed circuit rebreathers.
[1] [2] [12] [13] A maximum oxygen partial pressure of 1.4 bar for the active sectors of the dive, and 1.6 bar for decompression stops is recommended by several recreational and technical diving certification agencies for open circuit, [14] and 1.2 bar or 1.3 bar as maximum for the active sectors of a dive on closed-circuit rebreather ...
A jonline can also be used to tether the diver's equipment to the dive boat before or after the dive. This helps the diver to put on or take off the equipment while in the water without drifting away from the boat. It is similar to a buddy line, which is used to tether two divers together during a dive. [39] [41]