In the summer of 1997, NOAA hydrophones in the Pacific Ocean captured a sound so loud and powerful that it was detected over 5,000 kilometers apart. Dubbed “The Bloop,” the ultra-low-frequency sound sparked decades of wild theories—from unknown giant sea creatures and Megalodons to H.P. Lovecraft’s cosmic monster, Cthulhu. But what was it really? Discover the fascinating scientific investigation that revealed the terrifying truth behind the Bloop, and why its actual origin might be far more unsettling than a sea monster.
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