The Dyatlov Pass Incident
Maybe it’s best no one will ever know what happened with this case; the evidence is chilling enough.
In 1959, a group of experienced Russian hikers went missing on a skiing trip. When their camp was discovered, their tents were found torn open from the inside, and they were wearing very little clothing (in Russia, in winter). It gets weirder. The bodies were stained orange with massive internal injuries from a force that a doctor studying the incident compared to that of a car crash. There were no signs of struggle, despite victims with fractured skulls, broken ribs, and one woman missing her tongue, eyes and other parts of her face.
As you’d imagine, all sorts of theories to the cause of the deaths
have been tried and tested over the years, but the final verdict was
that the hikers died of a “compelling natural force”. What does that
even mean? Never has something so ambiguous been so horrifying. (Source)