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While searching Wikipedia to see if an over-the-top active sonar system I'd seen in a novel ('Typhoon' by Robin White) had any basis in reality, I stumbled across an article that reminds me of the 'sea stories' Clive Cussler used in 'Pacific Vortex'.
Supposedly Soviet/Russian subs in the North Atlantic/Arctic were tailed by mysterious noise sources called 'quackers' throughout the 60's, 70's & 80's.
The cause was never identified.
See:
http://en.wikipedia.org/wiki/Quacker_(sound)
Supposedly Soviet/Russian subs in the North Atlantic/Arctic were tailed by mysterious noise sources called 'quackers' throughout the 60's, 70's & 80's.
The cause was never identified.
See:
http://en.wikipedia.org/wiki/Quacker_(sound)