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Rebreather diving is practiced by recreational, military and scientific divers in applications where it has advantages over open circuit scuba, and surface supply of breathing gas is impracticable. The main advantages of rebreather diving are extended gas endurance, low noise levels, and lack of bubbles. [1]
Diving rebreathers must often deal with the complications of avoiding hyperbaric oxygen toxicity, while normobaric and hypobaric applications can use the relatively trivially simple oxygen rebreather technology, where there is no requirement to monitor oxygen partial pressure during use providing the ambient pressure is sufficient.
A Diving rebreather is an underwater breathing apparatus that absorbs the carbon dioxide of a diver's exhaled breath to permit the rebreathing (recycling) of the substantially unused oxygen content, and unused inert content when present, of each breath. Oxygen is added to replenish the amount metabolised by the diver.
Dive RAID International (formerly RAID) is a dive training organization which was founded in 2007 to support diver training for the Poseidon Mk VI Discovery Rebreather.It has since extended its scope to include open circuit scuba training and training for both recreational and technical diving sectors as well as snorkeling and freediving.
Longer decompression using a larger variety of mixtures may also complicate procedures. In closed circuit rebreather diving, use of a hypoxic diluent prevents the diver from conducting a diluent flush at shallow depths while breathing from the loop, so that it remains possible at the maximum depth of the dive, where it may be more critical.
By mid-1991, the magazine was using the term technical diving, as an analogy to the established term technical (rock) climbing. [3] [4]: 43 More recently, recognizing that the term was already in use by the Royal Navy for rebreather diving, Hamilton redefined technical diving as diving with more than one breathing gas or with a rebreather. [4]
The Clearance Divers Breathing Apparatus (CDBA) is a type of rebreather made by Siebe Gorman in England. The British Royal Navy used it for many years. [1] It was for underwater work rather than for combat diving. The main oxygen cylinders are on the diver's back. The oxygen cylinders at the front of the diver are for bailout.
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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