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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.
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 ...
Surface-supplied diver at the Monterey Bay Aquarium, Monterey, California US Navy Diver using Kirby Morgan Superlight 37 diving helmet [1]. Surface-supplied diving is a mode of underwater diving using equipment supplied with breathing gas through a diver's umbilical from the surface, either from the shore or from a diving support vessel, sometimes indirectly via a diving bell. [2]
A related skill is sharing breathing gas with another diver, both as the donor and the recipient. This is usually done with a secondary demand valve carried for this purpose. Technical and professional divers will also learn how to use a backup gas supply carried in an independent scuba set, known as the emergency gas supply or bailout cylinder.
A prescription mask contains lenses mounted in the scuba mask frame or bonded to the original viewports. Diving helmets are often used for surface-supplied diving. They provide the same benefits as the full face mask but provide a very secure connection of the gas supply to the diver and additionally protect the head.
Back gas – Scuba breathing gas carried on the back of the diver; Back kick (finning) – Finning technique to move backwards; Back-mounted scuba – Scuba set carried on the diver's back; Backplate and wing – Type of back-mount scuba harness; Backscatter – Reflection which reverses the direction of a wave, particle, or signal
Scuba skills are skills required to dive safely using self-contained underwater breathing apparatus, known as a scuba set. Most of these skills are relevant to both open-circuit scuba and rebreather scuba, and many also apply to surface-supplied diving. Some scuba skills, which are critical to divers' safety, may require more practice than ...
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. The name scuba is an acronym for "Self-Contained Underwater Breathing Apparatus" and was coined by Christian J. Lambertsen in a
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