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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 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.
Since this still lacks scientific confirmation, rampant speculation continues about potential extra-terrestrial theories for these "trumpet noises." But don't count NASA as a UFO-doubter just yet.
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Nasa says that “strange” noises heard coming from the troubled Boeing Starliner spacecraft are not an indicator that its crew are in any danger.. The unusual noises have now stopped and were ...
This is due to the influence of our knowledge and experience of many sounds we have heard. [8] In order to prevent hearing echo created by perceiving multiple sounds coming from different spaces, the human auditory system relates the sounds as being from one source. [9] However, that does not prevent people from being fooled by auditory illusions.
This sounds are now well known for coming from a movie "RED STATE" (2011). In the final scene we can here the "Trumpets of Apocalypse", this sound is the same sound heard in this videos -- Gargamail ( talk ) 21:55, 8 February 2016 (UTC) [ reply ]
An unexplained high-pitched tone has kept residents of a Portland suburb awake at night for at least a week.