National Oceanic and
Atmospheric Administration
United States Department of Commerce

The Bloop: An Underwater Mystery That Took Nearly 20 Years to Solve

Tue, 04/25/2017
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In 1997, while searching for underwater volcanoes off the coast of South America, scientists recorded something they couldn't explain: a strange, exceptionally loud noise. They called it "the bloop." The bloop was one of the loudest underwater sounds ever recorded: hydrophones (underwater microphones) more than three thousand miles apart all captured the same noise.