there was a incident on the night of February 2nd, 1959 called the Dyatlov Pass Incident.

The Dyatlov Pass incident resulted in the deaths of nine ski hikers in the northern Ural mountains on the night of February 2, 1959. It happened on the east shoulder of the mountain Kholat Syakhl (< which can be translated into Mountain of the Dead) The mountain pass where the incident occurred has since been named Dyatlov Pass after the group's leader, Igor Dyatlov.

he lack of eyewitnesses has inspired much speculation. Soviet investigators determined only that "a compelling unknown force" had caused the deaths. Access to the area was barred for skiers and other adventurers for three years after the incident. The chronology of the incident remains unclear because of the lack of survivors.

Investigators at the time determined that the hikers tore open their tent from within, departing barefoot into heavy snow and a temperature of 30C. Although the corpses showed no signs of struggle, two victims had fractured skulls, two had broken ribs, and one was missing her tongue. Their clothing, when tested, was found to be highly radioactive

source : [ Register or Signin to view external links. ]

a video that can explain this better :


I do honestly believe aliens f*ked them up, its seems the only way all this could happen on the same night