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In 1997, the Natonal Oceanic and Atmospheric Administration discovered an unusual, ultra-low-frequency sound emanating from a point off the southern coast of Chile. It was the loudest unidentified underwater sound ever recorded, detected by hydrophones 5,000 miles apart. It lasted for one minute and was never heard again.

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https://www.theatlantic.com/video/index/543105/the-bloop-loudest-sound-ever-recorded-cara-cusumano/?utm_source=atlfb