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Underwater breathing apparatus is equipment or systems which allow the user to breathe underwater. There is a sub-category for components. Subcategories.
Submarine escape trunk View inside a submarine escape trunk, looking up from below the lower hatch. An escape trunk is a small compartment on a submarine which provides a means for crew to escape from a downed submarine; it operates on a principle similar to an airlock, in that it allows the transfer of persons or objects between two areas of different pressure.
Static apnea (STA) is a discipline in which a person holds their breath underwater for as long as possible, and need not swim any distance. [1] Static apnea is defined by the International Association for Development of Apnea (AIDA International) and is distinguished from the Guinness World Record for breath holding underwater, which allows the ...
Elephant seals stay at sea for between 2 and 8 months and dive continuously, spending 90% of their time underwater and averaging 20 minutes per dive with less than 3 minutes at the surface between dives. Their maximum dive duration is about 2 hours and they routinely feed at depths between 300 and 600 m, though they can exceed depths of 1600 m.
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 ...
A cryogenic rebreather removes the carbon dioxide by freezing it out in a "snow box" by the low temperature produced as liquid oxygen evaporates to replace the oxygen used. A cryogenic rebreather prototype called the S-1000 was built by Sub-Marine Systems Corporation. It had a duration of 6 hours and a maximum dive depth of 200 metres (660 ft).
Kate Winslet, who held her breath underwater for 7 minutes and 14 seconds while filming "Avatar: The Way of Water," said the feat involved both physical and mental conditioning.
This class of equipment is now commonly referred to as a twin-hose diving regulator, [2] or demand valve. The Aqua-Lung was invented in France during the winter of 1942–1943 by two Frenchmen: engineer Émile Gagnan and Jacques Cousteau, who was a Naval Lieutenant (French: lieutenant de vaisseau). It allowed Cousteau and Gagnan to film and ...