The Dyatlov Pass incident (Russian) of the deaths of nine ski hikers in the northern Ural Mountains in the Soviet Union between 1 and 2 February 1959 under unclear circumstances. The experienced trekking group, who were all from the Ural Polytechnical Institute, had established a camp on the slopes of Kholat Syakhl in an area now named in honour of the group's leader, Igor Dyatlov. During the night, something caused them to tear their way out of their tents and flee the campsite while inadequately dressed for heavy snowfall and sub-zero temperatures.
