February 12, 2021 The Dyatlov Pass incident has intrigued people for generations, but a new theory pointing to a slab avalanche as the culprit does a thorough job of explaining how the 9 Russian trekkers died. A new video and more here. For more than 60 years, the mystery of the Dyatlov Pass incident – in which nine hikers in Russia met a mysterious end in February 1959 – has gone unsolved. How did the nine trekkers die on the snowy slopes of Russia’s Kholat Saykhl, a name that translates to Dead Mountain? Avalanche researchers, with some help from the movie Frozen, think they know the answer.