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Atlantic Diving Supply is a reseller of military equipment based in Virginia Beach, Virginia. [1] In 2019; they were the 24th largest federal contractor. [2]According to The Virginian-Pilot, "ADS packages related items into "kits" - cold-weather gear for soldiers or flame-retardant gear for firefighters, for example - to be shipped together."
Lightweight demand helmets are rigid structures which fully enclose the head of the diver and supply breathing gas "on demand". The flow of gas from the supply line is activated by inhalation reducing the pressure in the helmet to slightly below ambient, and a diaphragm in the demand valve senses this pressure difference and moves a lever to open the valve to allow breathing gas to flow into ...
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. Once breathed, the exhaled gas is vented to the surroundings.
Full face masks protect the face from dirty or cold water and reduce risk by securing the gas supply to the diver's face. If it contains no mouthpiece, the diver can talk, allowing the use of communications equipment. Half masks cover only the eyes and nose. The diver breathes from a separate mouthpiece on the regulator or rebreather.
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Diving support equipment is the equipment used to facilitate a diving operation. It is either not taken into the water during the dive, such as the gas panel and compressor, or is not integral to the actual diving, being there to make the dive easier or safer, such as a surface decompression chamber.
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The diver generally carries an emergency scuba gas supply connected to the helmet or bandmask at the bailout valve, or to the full-face mask via a bailout block. If the main gas supply fails, the diver opens the bailout valve and emergency gas is supplied through the same final delivery system that provides breathing gas under normal circumstances.