Dyatlov Pass incident

Case summary

Nine experienced hikers cut their tent open from the inside at night on the slope of Kholat Syakhl and were later found dead with hypothermia and severe trauma. The 1959 Soviet inquiry closed the file citing an 'unknown compelling force'; in 2020 the Russian Prosecutor General formalised a delayed slab-avalanche explanation, which remains disputed among specialists.

Timeline

1. 1959-01-27The group led by Igor Dyatlov set out from Vizhay.
2. 1959-02-01Camp was pitched on the Kholat Syakhl slope; the last photographs date from this evening.
3. 1959-02-26Searchers found the tent cut open from the inside and abandoned.
4. 1959-02-27The first five bodies were found at the treeline and on the slope.
5. 1959-05-04The remaining four bodies were recovered from a snow-filled ravine with severe trauma.
6. 1959-05-28The inquiry was closed citing an 'unknown natural force' and the file was classified.
7. 2020-07-11The Russian Prosecutor General announced a slab-avalanche conclusion after re-examination.
8. 2021-01-28Gaume and Puzrin's numerical avalanche model was published in Communications Earth & Environment.

People and connections

• Igor DyatlovPerson

  Expedition leader; Ural Polytechnical Institute student.

• Kholat SyakhlPlace

  'Dead Mountain' in Mansi; the slope where camp was pitched.

• Lev IvanovPerson

  Prosecutor who led the 1959 inquiry and wrote the closing report.

• Gaume & Puzrin (2021)Event

  The 2021 slab-avalanche simulation attempting to explain the trauma pattern.

• Igor Dyatlov to Kholat SyakhlCamp position on the night of 1 February
• Lev Ivanov to Gaume & Puzrin (2021)The 1959 closing report and the 2021 model read the same evidence differently

Findings

Every finding lists its source and date. Interpretation stays in the researcher's note.

• The tent was cut open from the inside and abandoned; all nine died away from camp.

  VerifiedSource: 1959 case file1959-05

• Six deaths were attributed to hypothermia and three to severe chest or skull trauma.

  VerifiedSource: Forensic reports1959-05

• A delayed slab avalanche could account for the trauma pattern and the abandonment of the tent.

  ProbableSource: Gaume & Puzrin, Nature CEE2021-01

• The objection that the slope was too gentle for an avalanche remains in tension with the 2020–2021 model.

  ContestedSource: Expert critiques2021

• Claims of infrasound weapons, missile tests or covert military activity are not supported by primary documents.

  UnverifiedSource: Open archive review2026-05

Documents

• PhotographFinal roll of expedition filmFrames showing the tent being pitched on 1 February, preserved in the case file.
• Document1959 closing resolutionThe resolution containing the 'unknown compelling force' wording.
• MapSearch-area sketchOriginal sketch marking the tent, body positions and the cedar tree.

Sources

1. 01

   Dyatlov Pass incident

   Wikipedia, 2026, Encyclopedia entry

   Open source
2. 02

   Mechanisms of slab avalanche release at the Dyatlov Pass

   Communications Earth & Environment, 2021, Peer-reviewed paper

   Open source
3. 03

   Has science solved the Dyatlov Pass mystery?

   National Geographic, 2021, Science reporting

   Open source
4. 04

   Dyatlov Pass case files (scanned archive)

   dyatlovpass.com, 2019, Scanned case-file archive

   Open source

Locations

• Camp site (Kholat Syakhl slope)61.76°, 59.46°
• Vizhay (last settlement)61.15°, 60.05°

Researcher's note

Interpretation: the strength of this file is that the 1959 primary documents (autopsies, sketches, photographs) are now openly available as scans. The avalanche model is physically consistent, but a model demonstrates possibility, not independent confirmation from the scene. No exotic explanation has ever cleared the evidence threshold.