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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 Pentagon's latest report on UFOs has revealed hundreds of new instances of unidentified and unexplained aerial phenomena -- including a recent near miss involving a commercial plane and a ...
Pages in category "Unidentified sounds" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...
In the case of Kokomo, Indiana, a city with heavy industry, the origin of the hum was thought to have been traced to two sources. The first was a 36 Hz tone from a cooling tower at the local DaimlerChrysler casting plant and the second was a 10 Hz tone from an air compressor intake at the Haynes International plant. [ 21 ]
Moneymaker said the October 2023 incident was deemed credible after ruling that species known in the area would not have been able to emit the “strange unidentified sound” that was reported.
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Upsweep is an unidentified sound detected by the U.S. National Oceanic and Atmospheric Administration's (NOAA) equatorial autonomous hydrophone arrays. The sound was recorded in August, 1991, using the Pacific Marine Environmental Laboratory's underwater sound surveillance system, SOSUS .
The terms "mistpouffers" and "Seneca guns" both originate in Seneca Lake, New York, and refer to the rumble of artillery fire. James Fenimore Cooper , author of The Last of the Mohicans , wrote " The Lake Gun " in 1850, a short story describing the phenomenon heard at Seneca Lake, which seems to have popularized the terms.