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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.
A skyquake is a phenomenon where a loud banging sound is reported to originate from the sky. The sound may cause noticeable vibration in the ceiling or across a particular room. Those who experience skyquakes typically do not have a clear explanation for what caused them and they are perceived as mysterious.
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The bursts of sound resemble quacks, earning the recording the nickname “Bio-Duck.” Speculation about their source was varied. It could be an underwater submarine, or a fish .
Now NASA is stepping in to provide some insight into what could actually be causing this scary pattern. NASA scientists believe the ominous noises could potentially be the "background noise" of ...
The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.
Astronauts had noted ‘strange’ sounds – and space agency did not immediately have an explanation. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
Unidentified sounds (11 P) U. Unidentified flying objects (5 C, 7 P) W. ... Pages in category "Unexplained phenomena" The following 35 pages are in this category, out ...