Project Sound

Level 3 – Deep Web

Possibly related to “The Hum”. The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people. Hums have been reported in the United States, United Kingdom, New Zealand and Canada,[1] and are sometimes named according to the locality where the problem has been particularly publicized, such as the “Taos Hum” in New Mexico and the “Windsor Hum” in Ontario.

LINKS
https://en.wikipedia.org/wiki/The_Hum