The Dyatlov Pass incident (Russian: гибель тургруппы Дятлова, transl. "Death of the Dyatlov Group") was an event in which nine Soviet hikers died in the northern Ural Mountains between February 1 and 2, 1959, in uncertain circumstances. The experienced trekking group from the Ural Polytechnical Institute, led by Igor Dyatlov, had established a camp on the eastern slopes of Kholat Syakhl in the Russian SFSR of the Soviet Union. Overnight, something caused them to cut their way out of their tent and flee the campsite while inadequately dressed for the heavy snowfall and sub-zero temperatures.