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A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]
Diving mask. A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [ 1][ 2] Surface supplied divers usually use a full face mask or diving helmet, but in some systems the half mask may be used. [ 2]
Human factors in diving equipment design are the influences of the interactions between the user and equipment in the design of diving equipment and diving support equipment. The underwater diver relies on various items of diving and support equipment to stay alive, healthy and reasonably comfortable and to perform planned tasks during a dive.
Human physiology of underwater diving. Human physiology of underwater diving is the physiological influences of the underwater environment on the human diver, and adaptations to operating underwater, both during breath-hold dives and while breathing at ambient pressure from a suitable breathing gas supply. It, therefore, includes the range of ...
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 full-face mask may allow the diver to breathe through the nose or mouth as preferred. The demand valve adds a little respiratory dead space to the airway. The work of breathing is greater due to hydrostatic pressure differences between the depth of the demand valve and the lungs, and due to cracking pressure and flow resistance in the demand ...
Inhaling from a mouthpiece becomes second nature very quickly. The other common arrangement is a full-face mask which covers the eyes, nose and mouth, and often allows the diver to breathe through the nose. Professional scuba divers are more likely to use full-face masks, which protect the diver's airway if the diver loses consciousness. [43]
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.