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Exley was the first in the world to log over 1,000 cave dives (at the age of 23); in 29 years of cave diving, he made over 4000 dives. [10]Exley had an unusual resistance to nitrogen narcosis, and was one of the few divers to survive a 400-foot (120 m) open-water dive on simple compressed air.
Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. [1] The word scuba is an acronym for "Self-Contained Underwater Breathing Apparatus" and was coined by Christian J. Lambertsen in a patent ...
Typical fields in a recreational diver's log book would be the following: Header - Contains basic information about the date, time and location of the dive. Profile - Records sufficient detail to show the profile of the dive. Equipment - Shows what the diver was wearing and what dive gear was used during the dive.
In scuba diving, the dive log documents the experience of a diver by logging a diver's dives. In the fishing industry, a logbook is used to record catch data as part of the fisheries regulations. It is then submitted to the fishing authorities of the vessel's flag state. [citation needed]
The threads of cylinder and valve must be of matching thread specification, clean and full form, undamaged and free of cracks, burrs and other imperfections. Tap marks [note 3] are acceptable and should not be confused with cracks. Other neck surfaces will also be examined to be sure they are free from cracks.
The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.
A major difference between rebreather diving and open-circuit scuba diving is in fine control of neutral buoyancy. When an open-circuit scuba diver inhales, a quantity of highly compressed gas from their cylinder is reduced in pressure by a regulator, and enters the lungs at a much higher volume than it occupied in the cylinder.
The invention revolutionised autonomous underwater diving by providing a compact, reliable system capable of a greater depth range and endurance than its precursors, and was a major factor influencing the development of recreational scuba diving after WWII. The twin-hose Aqua-Lung demand regulator is the foundation of all modern scuba regulators.
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