Upsweep Sound – Pacific ocean

Nearest city: Central Pacific Ocean Ridge

First detected in 1991 by NOAA’s Pacific Marine Environmental Laboratory, “Upsweep” is a repeating underwater sound consisting of long, narrow-band upsweeping tones. The source has never been identified, but it appears strongest in the central Pacific Ocean, near volcanic and tectonic activity along the mid-ocean ridge. The signal peaks in spring and autumn, suggesting a natural but unexplained link to seasonal changes. While many scientists suspect undersea volcanic activity, paranormal enthusiasts frame Upsweep as evidence of massive, unknown life forms calling across the ocean depths.

Pin: Cryptid
Spookiness Rating: 5.0

Featured on the Youtube Channel: Concerning Reality (2023), The Mysterious Sound in the Pacific that Won’t Go Away (Upsweep)

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Article: en.wikipedia.org/wiki/Upsweep

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