Flashback Friday: Researchers identify mysterious sounds first heard by 1960s submarines.

Photo: Wikimedia Commons

In the 1960s, sailors in submarines off the coasts of Antarctica and Australia noticed a mysterious noise, which they called the “bio-duck sound” due to its resemblance to a duck quacking (see video below). The source of the sound remained a mystery for decades… until now. In this study, researchers discovered the bio-duck sounds in recordings that also contained sounds already known to be produced by Antarctic Minke whales. The association of the bio-duck sou

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