Diving Mask, Full Face 02
Diving Mask, Full Face 02 : Features: The older Royal Navy Clearance Diver's and British SBS frogman's full-face mask with a big front window and a mouthpiece inside made by Siebe Gorman Full-face diving mask have these features, with these results: (1) Straps firmly fasten it to the head: It takes longer to remove the mask when needing to switch to breathing from atmosphere. To avoid this, most full-face masks have a valve to switch between breathing from the set and breathing from atmosphere. That set/air valve should be easily operated by the diver, including if he has thick diving gloves, but not projecting so that it can be easily knocked against things. An excess of bulky projecting valvework may cause water resistance in swimming and moving his head about. Most full-face masks can be knocked off much less easily than an ordinary scuba mouthpiece or an ordinary eyes-and-nose diving mask; but an excess of bulky projecting valvework may act as a lever for his head to be pushed around by. These risks can happen in these circumstances: When working or moving about in zero visibility water or in the dark. This often happens with underwater work, as a work diver cannot choose time and place of diving as easily as a sport diver. If he is involved in a hand-to-hand fight underwater. This risk may happen with combat / patrol frogmen in war conditions, or with diving sea-police arresting suspects underwater. In this case, his set/air valve should be where an opponent cannot easily grasp it, either to operate it, or to use it as a handle to pull the mask off or to pull the head about. If there is a risk of him becoming unconscious underwater. (For the same reason, many industrial breathing sets and a few scuba set have a mouthpiece with a strap that fastens behind the back of the neck)
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