In 1959, nine experienced cross country skiers, led by Igor Dyatlov, were trapped in a snowstorm and decided to set camp and sleep it out.
Later that night, something made all nine people leave their tents in such a hurry that they ripped them open from within. These people stumbled down the slope, in subzero weather, only in their underwear with no socks or shoes. All nine were discovered dead and frozen by a search party about a month later.
Here’s where it gets really creepy: three of the nine suffered massive chest and head injuries that could only be caused by forces akin to that of a car crash, but without any external wounds. There were high doses of radioactivity. And if those weren’t weird enough: two others had major chest fractures and the body of one of the group was missing both its eyes. and another victim was missing her tongue.