#thehum #unsolvedmysteries #strange #paranormal #creepy They call it the Hum- a strange, low rumble people hear worldwide. Some say it's machines underground... others think it's something not of this world. Here's the creepy part: thousands claim they hear it- but microphones pick up nothing. So... if the sound is real, why can't we prove it?

“The Hum only humans could hear”