The Bloop
The Bloop's sound was heard over 3,000 miles away! The Bloop is a mysterious ultra-low frequency sound originating in the South Pacific that was heard by two stations 5,000 kilometres apart. Some say that it may be an Ice-quake created by the caving of a massive iceberg off the Antarctic coast. Others speculate that it could have been made by some gargantuan creature. You can hear the original sound sped up 16X on the Wikipedia page for the Bloop, here:


In the summer of 1997, the NOAA discovered the anomaly with sonar used for dectecting Soviet Navy submarines. It was found in the Pacific Ocean. NOAA's system ruled out its origin as any known man-made sound, such as a submarine or bomb, or familiar geological sounds such as volcanoes or earthquakes. While the audio profile of the bloop does resemble that of a living creature, the system identified it as unknown because it was far too loud for that to have been the case: it was several times louder than the loudest known biological sound. Five other significant unexplained sounds have been named by NOAA: Julia, Train, Slowdown, Whistle, and Upsweep. Halo

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