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Commercial surface supplied diving may routinely reach depths of 50 metres on air, but the diver is monitored from the surface and the airway is protected by a full-face mask or helmet. [60] Tests have shown that all divers are affected by nitrogen narcosis, though some experience lesser effects than others.
When an unresponsive diver is found the rescuer should assess the security of the airway by checking if the mouthpiece or full-face mask is in place. [2] If the mouthpiece is in place, it should be retained in position. If not, it should be replaced if the divers are in an overhead environment and the casualty cannot be surfaced without delay. [2]
The copper helmeted, free-flow, standard diving dress is the version which made commercial diving a viable occupation, and although still used in some regions, this heavy equipment has been superseded by lighter free-flow helmets, and to a large extent, lightweight demand helmets, band masks and full-face diving masks.
The semi-closed rebreather systems developed by Drägerwerk in the early 20th century as a scuba gas supply for Standard diving dress, using oxygen or nitrox, and the US Navy Mark V Heliox helmet developed in the 1930s for deep diving, circulated the breathing gas through the helmet and scrubber by using an injector system where the added gas ...
Helmets for head protection, and head mounted lights may snag the long regulator hose which is looped around the neck and may cause difficulty changing the diving mask. [48] Head mounted lights also increase diver profile and hydrodynamic drag, and increase the risk of shining the light in the buddy's eyes when looking towards him. [48]
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