Account

In late January 1959, a nine-member Soviet mountaineering team led by Igor Dyatlov entered the Ural Mountains to climb Kholat Syakhl, which in the local Mansi language means Dead Mountain. On the night of 1 February, they camped on the slope. Contact was lost. On 26 February, searchers found their tent cut open from the inside, with belongings and shoes left inside. Two bodies were found nearby, wearing only underwear, barefoot, dead of hypothermia. Between 5 March and 4 May, the remaining seven bodies were found. Four were in a ravine, their deaths anomalous.

Contested

Autopsies showed two victims had severe skull fractures without corresponding external wounds. One had a crushed chest. One woman's tongue was missing, and one man's eyeballs were missing. Some victims' clothing tested positive for high-intensity radiation. One victim's camera contained an abnormally exposed final photograph. In May 1959, Soviet authorities announced that the deaths were caused by an overwhelming natural force and sealed the case. Competing hypotheses include avalanche, military test, infrasound, Mansi conflict, and supernatural forces. A 2021 Swiss paper proposed a slab avalanche model, but it still cannot explain the radiation and missing organs.

Sources

• Soviet investigation archives (partially declassified)
• forensic reports
• 2019-2021 Russian re-investigation
• 2021 Swiss paper