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The Aqua-Lung is a self-contained open-circuit demand system, which means that breathing gas is provided from high-pressure storage carried by to the diver on demand, when the diver inhales and reduces the pressure in the supply hose, subsequently the flow is shut off when not required.
The craft weighs 2,100 kilograms (4,600 lb) out of water and is 7 or 8 metres (23 ft 0 in or 26 ft 3 in) long according to type. It resembles a torpedo but has two cockpits for the crew. Some models have a roof with sliding doors for the cockpits. In some models the rear cockpit is long and can seat two divers for a total crew of three.
Trubridge in 2010 Trubridge while freediving. William Trubridge MNZM (born 24 May 1980) is a New Zealand world champion and world record holding freediver.. Trubridge was the first diver to go deeper than 100 metres (330 ft) without oxygen and as of 2013 held the world record in the free immersion and constant weight without fins disciplines.
[21] 332 metres (1,089 ft) is the world record depth on scuba (2014). [22] Commercial divers using saturation techniques and heliox breathing gases routinely exceed 100 metres (330 ft), but they are also limited by physiological constraints. Comex Hydra 8 experimental dives reached a record open water depth of 534 metres (1,752 ft) in 1988. [23]
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The word SCUBA was coined in 1952 by Major Christian Lambertsen who served in the U.S. Army Medical Corps from 1944 to 1946 as a physician. [1] Lambertsen first called the closed-circuit rebreather apparatus he had invented "Laru", an (acronym for Lambertsen Amphibious Respiratory Unit) but, in 1952, rejected the term "Laru" for "SCUBA" ("Self-Contained Underwater Breathing Apparatus"). [2]
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