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Archives; Cerberus (diver detector)
Is this group still working? I have not received any messages from it for a long time.
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There is a new underwater diver-detector called Cerberus. See:-
It is intended to detect attacking frogmen in these days of security worries.
It will likely also help authoritarian sea-patrol types to see where sport divers are.
Including putting one in your favorite quarry dive and it is wired up to tell the water bailiff or whoever that there are divers in the water, if it proves to be fairly cheap.