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Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
The sound's source was roughly triangulated to , a remote point in the South Pacific Ocean west of the southern tip of South AmericaThe sound was detected by the Equatorial Pacific Ocean autonomous hydrophone array, [1] a system of hydrophones primarily used to monitor undersea seismicity, ice noise, and marine mammal population and migration.
The sound was recorded in August, 1991, using the Pacific Marine Environmental Laboratory's underwater sound surveillance system, SOSUS. [ 1 ] [ 2 ] Loud enough to be detected throughout the entire Pacific Ocean , Upsweep remains one of the only detected sounds to have an unresolved origin . [ 3 ]
Scientists used an acoustic antenna: a group of underwater devices attached to the back of the ship that detect and record ocean sounds from all directions. The antenna allowed them to figure out ...
The sound was detected at 2am local time by a Canadian P-3 aircraft. It first came every 30 minutes and was heard again four hours later, the internal government memo obtained by CNN states.
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Explore the Wikipedia category dedicated to unexplained phenomena, featuring a collection of mysterious events and occurrences.