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The “Bloop” Was Caused by an Icequake.

In 1997, researchers recorded a mysterious underwater sound that came to be known as “the bloop.” In 2005, they finally identified its source — the unique sound was caused by an “icequake” — an iceberg cracking and breaking away from an Antarctic glacier. Icequakes — and, presumably,  accompanying “bloops” — are becoming more common due to global warming.

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