NOAA hydrophones Archives -

Slow Down Sound: NOAA’s Strangest Underwater Audio Recording

Imagine a sound so low that your ears cannot catch it. Then imagine scientists speeding it up 16 times, and a long, falling groan fills the room. That is the…

DR RABICA October 3, 2026

Deep Sea Mysteries

Upsweep Sound Mystery: The Ocean Noise Scientists Never Fully Solved

Imagine a sound that has played in the Pacific Ocean for decades, and nobody can say exactly where it comes from. The Upsweep sound mystery started in August 1991, when…

DR RABICA October 1, 2026

Deep Sea Mysteries

Mysterious Sounds Deep Ocean: The Bloop and Other Deep Sea Mysteries Scientists Still Debate

Picture a hydrophone sitting on the seafloor. Without warning, it picks up a boom so loud it crosses thousands of miles of open water. That is exactly what happened in…

DR RABICA July 13, 2026

Slow Down Sound: NOAA’s Strangest Underwater Audio Recording

Upsweep Sound Mystery: The Ocean Noise Scientists Never Fully Solved

Mysterious Sounds Deep Ocean: The Bloop and Other Deep Sea Mysteries Scientists Still Debate

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