Scientists identify cause of mysterious "Bloop": it's the sound of icebergs calving in Antarctica
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Decades Ago a Huge Noise Roared in The Ocean. For Years It Was a Mystery.
https://www.sciencealert.com/decades-ago-a-huge-noise-roared-in-the-ocean-for-years-it-was-a-mystery
In 1997, a deep belch echoed through the belly of Earth's oceans.