During the second half of 2011, people from all over the world started reporting hearing very strange, unidentified loud noises coming from the sky.
There are hundreds of reported cases out there, and i will present some of the best and most unique ones.
Several people have filmed the bizarre sound over the past 10 years, however it all really began in 2011 when a video of the eerie sound was uploaded to YouTube. Since then hundreds of cases were reported of people hearing the noises from all around the globe. And as i mentioned before, they are not always the same. They are described as a hum or low rumble, roar, thump, whistle, and more.
Unseen Horrors, Hitman by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0