Strange Sound Phenomenon: The Mysterious “Quackers” Noises Experienced During the Cold War

What is the source of this unexplained underwater noise? Undersea UFOs? animals? Unidentified Submerged Objects? ”Quackers” are mysterious sounds similar to a frog noise that had been widely experienced by Soviet Navy submarine crews from various parts of the North Atlantic and Arctic Oceans during the peak of the Cold War. They are an example of Unidentified Submerged Objects.

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During the Cold War, when Soviet ballistic missile submarines went to patrol northern seas, their crews started reporting the mysterious frog-like sounds, which soon were dubbed “quackers”, from the Russian rendition of a frog noise.

These sounds appeared when submarines passed certain zones in the sea, and behaved as if they were emitted by some moving underwater object, which, however, failed to register on the active sonar. When the sub left their “patrol zone”, the objects disappeared after emitting one final “quack”.

These objects exhibited behavior not unlike some living being or manned vessel, showing obvious interest in the passing submarine, circling around it, trying to actively avoid sonar pulses, and so on. The speed of some of these objects (estimated from Doppler shift of their sound frequency) was in the range of 200 km/h, much higher than any then-known man-made vessel. Contact was attempted on several occasions, but, apart from some obvious reactions to these attempts such as changing the pitch of the sounds or movement of the apparent sound source), nothing came of it. (SOURCE)

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