00:00In 1997, deep in the Pacific Ocean, scientists recorded a sound unlike anything ever heard before.
00:07It was ultra-low, deep, and incredibly loud. Loud enough to be heard over 5,000 kilometers away.
00:14They called it the blue. It didn't match any submarine, whale, or geological activity known
00:20to science. Some believed it was a creature larger than a blue whale. Others suggested
00:25something far stranger. Even now, no one can explain exactly what made the sound. The
00:30ocean still holds its secrets.
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