Quacker (sound)

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Quacker is a type of underwater acoustic low frequency oscillation widely reported by the crews of Soviet Navy submarines from various parts of the North Atlantic Ocean and Arctic Ocean during the Cold War. The name comes from the similarity of some of the recorded signals to the sounds made by frogs, although various sounds were reported in addition to the "quack" (the Russian rendition of a frog noise). The first cases were reported in the 1970s, with reports peaking from 1975 through the 1980s.

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