Russia's Dyatlov Pass Incident, the Strangest Unsolved Mystery of the Last Century
http://motherboard.vice.com/blog/dyatlov-pass-incident-strangest-unsolved-mystery#ixzz2P2C1c8w7

Of a party of ten skiiers, nine perished in the middle of a high-difficulty trek in conditions that reached -30 degrees Celsius. But the details, which are mostly based on diaries of those involved as well as records from Soviet investigators, are chilling: On the night of February 2, 1959, members of the party apparently ripped their tent open from the inside, and wandered into the tundra wearing nothing but what they wore to bed.