What you didn't want to meet on that plane wreck by Anthony Appleyard ()
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Never mind the diving gear makers charging a fortune and likely telling authority about what they sell to who :: some waterfront kit-repairers know how to make something useful such as a patrol frogman's rebreather out of a sport diving stab-jacket and a gasmask and industrial oddments.
Background from the WWW.
And my pneumatic rifle model.