In 1997, a mysterious sound known as the "Bloop" echoed through the depths of the ocean, sparking speculation about its origins. The sound was said by many to be the creepiest thing they had ever heard, writes Science Alert .
US National Oceanographic and Atmospheric Administration (NOAA) scientists, while deploying hydrophones closer to Antarctica, discovered, quite by accident, that the "Bloop" originates from the breakup of Antarctic ice sheets.
These discoveries confirmed the suspicions of scientists, noting that the loudest sound ever recorded underwater was not the result of underwater military exercises or creatures from the depths, but the natural sound of ice cracking in the southern part of the Earth.
The new data also shows that similar sounds are produced by glaciers today, illuminating another aspect of Antarctica's fascinating symphony.
The discoveries in Antarctica, collected between 2005 and 2010, confirmed what many scientists suspected from the beginning. NOAA oceanographer Chris Fox told CNN's Richard Stenger in 2001 that he thought the "Bloop" might be coming from chunks of ice breaking off in Antarctica, and he was right, Science Alert reports.
By 2012, seismologist Robert Dziak told WIRED's Ian Steadman that NOAA's hydrophones pick up tens of thousands of "Bloop"-like sounds in the ocean each year.