The Dyatlov Pass Incident is based on a true story about a mysterious event that resulted in the deaths of nine ski hikers in the northern Ural mountains on the night of February 2, 1959. The story makes for an intriguing film. Here's a little background on the event from Wiki:
The lack of eyewitnesses has inspired much speculation. Soviet investigators simply determined that "a compelling natural 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 −30 °C (−22 °F). Although the corpses showed no signs of struggle, two victims had fractured skulls, two had broken ribs, and one was missing her tongue.
It was directed by Renny Harlin who directed films such as Die Hard 2, Cliffhanger, and A Nightmare on Elm Street 4: The Dream Master. He's currently directing Hercules 3D. The movie was filmed in the documentary style, and I think it looks great! Hope you enjoy the trailer!