Dyatlov Pass incident

The Dyatlov Pass incident refers to the unsolved deaths of nine ski hikers in the northern Ural Mountains in the Soviet Union between 1 and 2 February 1959. 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 honor 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.

After the group's bodies were discovered, an investigation by Soviet Union authorities determined that six had died from hypothermia while the other three showed signs of physical trauma. One victim had a fractured skull; two others had major chest fractures.