The last thing you want to hear in the middle of the night is the sound of high-pitched grinding floating through the trees. To me, this would signal the imminent invasion of aliens and I would be out of there in a flash.
However, Redditor enamore22 stood their ground, grabbed a camera, and started filming. While we never see anything extraterrestrial in the footage, the sounds are disturbing to say the least.
Take a listen for yourself in the video below.video-player-present
The Redditor says the sounds went on for about 15 to 20 minutes before stopping. According to one commenter, what we're hearing here is not aliens. It is actually a manual test to calibrate a nearby AM radio antenna. This is usually done during the day when people are at work, but this must have been an emergency situation.