1. 'The Bloop'

In 1997, strange sounds were recorded deep in the South Pacific by the U.S. National Oceanic and Atmospheric Administration. The sound, which to the untrained ear seemed biological in nature, led to suggestions it could have been caused by a massive whale, unknown sea monster or even the god of the The Deep Ones himself, Cthulhu. Listen to it below:

In reality, NOAA has since concluded the 'bloop' was in fact caused by icequakes - the fracturing and breaking off of ice shelves thousands of miles away.

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