![]() The most popular speculation about Slowdown is that it was caused by the break-up of Antarctic ice – which means it might give an indication of climate change. Maybe a bottle opening or suction cup.These free funny sound effects can be downloaded and used for video editing. So what’s behind the strange noises? The Bloop sounds like it might have been created by an animal, but it is far louder than any whale song, so a marine creature that made it would either be bigger than any whale, or a much more efficient producer of sound. Over the course of about 7 minutes, it slowly dropped in pitch, rather like the sound of an aeroplane flying past ( Its origin has been only loosely pinned down: it seems to have originated from somewhere off the west coast of South America, and could be heard from 2000 kilometres away. 'The Bloop' is the given name of a mysterious underwater sound recorded in the 90s. In May 1997, hydrophones picked up the “Slowdown” sound. No one knows what made the sound, now known as “The Bloop” (hear it at It’s not the only mysterious sound heard in the ocean. The hydrophones, a relic of cold-war submarine tracking, picked up this signal again and again during those summer months, then it was never heard again. For a minute, it rose rapidly in frequency then it disappeared. ![]() IN THE summer of 1997, an array of underwater microphones, or hydrophones, owned by the US government picked up a strange sound. National Oceanic and Atmospheric Administration (NOAA) in 1997. (Image: Darryl Leniuk / Photographer' s Choice / Getty) Bloop was an ultra-low-frequency, high amplitude underwater sound detected by the U.S. The Bloop signal sounds like it was made by an animal, but nobody knows what could have done it
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