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  Subsequent to reports of diving incidents, and to discussion of officialdom
and diving: In the 1970's someone told me of a part of the south coast of
England where there is a big Ministry of Defence area along the coast, but no
(at least, no generally-known) official restrictions on public sea usage
offshore from it, where there were reports of "diver deaths, mass deaths of
fish, and divers coming back and reporting strange [underwater] sonic noises".
Powerful ultrasound can be lethal, as was soon found when early ultrasound
research used water with fish in. Whether this was an actual anti-diver weapon
when some sport diver got too near a secret underwater listening post or
something, whether it was a side-effect of a powerful long-range modulated
ultrasound underwater communication beam: has anyone else heard of such a
hazard? I once read a book by one of Cousteau's associates, which in one place
speculated with dread on the start of common use of powerful underwater
ultrasound guns as weapons against submerged divers.

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