MY-26001
Brief
Nine experienced ski-hikers from the Ural Polytechnic Institute died under unexplained circumstances on the eastern slope of Kholat Syakhl in February 1959. The case was officially reopened by Russian authorities in 2019.
Filed 2026-05-01 · Last updated 31 May 2026
Nine experienced ski-hikers from the Ural Polytechnic Institute died on the night of the first to the second of February 1959, on the eastern slope of a mountain called Kholat Syakhl in the Northern Urals. They had cut their way out of their own tent and walked, half-dressed, into a winter night. Some froze. Others died of injuries a forensic examiner compared to a car crash. The case has stayed open in the public mind because the official record describes the deaths plainly but never quite explains them.
The group, led by twenty-three-year-old Igor Dyatlov, set out to reach Mount Otorten on a demanding ski-tour graded at the highest difficulty of the day [1]. On the first of February they pitched their tent on an open slope rather than in the treeline below, cutting a flat platform into the snow to do so [5]. That night something drove all nine outside.
When a search party reached the tent on the twenty-sixth of February, it was found cut open from the inside, with most equipment and footwear left behind [1]. The bodies were recovered in stages. Four were found near a cedar tree about a mile and a half downslope on the twenty-seventh of February; a fifth, Rustem Slobodin, on the fifth of March [1]. The final four were not found until the fifth of May, buried in a ravine under deep snow [1]. The criminal case was closed in May 1959 for want of a guilty party, then archived and classified [1].
The 1959 autopsies are the firm ground here. The first group died of hypothermia, though the record notes oddities: third-degree burns on one hiker, frostbitten hands, a fractured frontal bone on Slobodin [2]. The ravine group showed far worse. Lyudmila Dubinina and Semyon Zolotaryov had multiple broken ribs; Nikolay Thibeaux-Brignolle had a severe skull fracture [2]. The forensic examiner, Boris Vozrozhdenniy, recorded that such chest injuries required a force he likened to a car or a blast, yet the bodies bore no matching external wounds [2]. Dubinina and Zolotaryov were also missing their eyes, and Dubinina her tongue — findings often read as soft-tissue loss from water and decomposition in the ravine, since the four lay there for months [2].
A radiological test late in the inquiry found elevated radiation on the clothing of two hikers [3]. This is documented. The measured reading of it links the traces to civilian nuclear work — Krivonischenko was employed at the Mayak plant near Kyshtym — rather than to the deaths [3].
In 1990 the lead investigator, Lev Ivanov, published an article claiming he had been ordered to drop references to luminous spheres seen in the sky that winter, and that he believed an unknown energy was involved [4]. This is his later testimony, not a finding from the file.
In July 2020 the Prosecutor General’s Office closed a fresh review. It concluded that a slab of snow, loosened by the cut platform and a sharp drop in temperature with strengthening wind, shifted above the tent in the dark [5]. The party fled in near-zero visibility, reached the trees, and died of cold; the ravine four, it held, were crushed when a snow shelf they had dug into collapsed [5]. In 2021 two engineers, Johan Gaume and Alexander Puzrin, published modelling in a Nature journal showing how a small, delayed slab avalanche on so gentle a slope was physically plausible, and how a falling block could break ribs through bedding without marking the skin [6].
The avalanche model is coherent but not complete. It does not by itself account for the radiation traces, the burns, or why the hikers fled so lightly clothed rather than wait out a survivable snow-slip. No avalanche debris was noted in 1959. These gaps keep theory alive — infrasound, a military test, the lights Ivanov described — none of it documented in the file.
CONFIDENTIAL tier reflects a case that is officially resolved yet evidentially contested. The autopsies, the cut tent, and the radiation reading are on the record. The avalanche conclusion rests on modelling and reconstruction, which relatives and the Dyatlov Foundation continue to dispute. Outstanding: a public, line-by-line release of the full 2019–2020 review materials.