The Dyatlov Pass incident
In February 1959 nine skiers cut their way out of their tent on a Ural mountainside and died in the snow. This case reads the Soviet file itself, marks the state’s records as the state’s, and tests six explanations by the same rules.
The question What killed nine experienced hikers in the Ural Mountains in February 1959, and why did they cut their way out of their tent?
What the records say
The documented story holds up: 13 of 14 timeline steps are Confirmed by the records (score 98).
6 theories checked: 5 unverified, 1 disputed. A theory is rated by its key claim.
A peer-reviewed study shows how a small slab avalanche could have hit the tent
confirmedCredible: it rests on a primary (tier-1) record. See the step
Down the rabbit hole
The ground line is the documented timeline. Each tunnel is a theory that branches off it; every chamber is a step, coloured by how well the records support it. The deepest chamber is the theory’s key claim. Tap one to open it.
Main timeline
Oldest first- 23 Jan 1959confirmed
Ten skiers led by student Igor Dyatlov set out for Mount Otorten; one turns back
The group, mostly students and graduates of the Ural Polytechnic Institute, planned a top-category ski trek in the northern Urals. Yuri Yudin left the group early and returned home; the 1959 file says through illness on 28 January, ABC says injuries.
T11959 case file: closing resolutionsheet 384involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2CNN, 4 Feb 2019T2ABC News (Australia), 6 Feb 2019T2IBTimes UK, 3 Feb 2014 - 1 Feb 1959confirmed
They pitch their tent on the open slope of Kholat Syakhl, cutting into the snow
Their last photograph shows them digging out a platform in the slope before sunset. The 1959 closing resolution dates this to about 5 pm and calls the late start of the climb, at 3 pm, Dyatlov’s “gross mistake”.
T1Gaume and Puzrin, Communications Earth & Environment, 2021Fig. 1 captionT11959 case file: closing resolutionsheets 384–385involved party: Soviet state (Sverdlovsk regional prosecutor’s office) - Night of 1–2 Feb 1959confirmed
All nine leave the tent in a hurry through cuts made from the inside
Searchers later found the tent cut open from inside with nearly all footwear and outer clothing left in it, and eight or nine sets of tracks, some in socks or barefoot, leading about 500 metres downhill. The 1959 file found no traces of a struggle or of other people.
T11959 case file: closing resolutionsheets 385–386involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2ABC News (Australia), 6 Feb 2019T2CNN, 4 Feb 2019 - 17 Feb and 31 Mar 1959confirmed
The case file records glowing balls in the sky seen on 17 February and 31 March
A meteorologist, two soldiers and G. Atmanaki of another ski group each described a bright ball in haze at about 6:40–7:05 am on 17 February; a further report describes a “fire ring” on 31 March. Both dates are after the hikers died.
T11959 case file: sky sightingssheets 209–220, 227, 260, 264, 266, 344involved party: Soviet state (Sverdlovsk regional and Ivdel prosecutors) - 20 Feb to Mar 1959confirmed
The search finds the tent and the first five bodies, most of them dead of cold
A search began on 20 February; the tent was found on 26 February. Doroshenko and Krivonischenko lay by a burnt-out fire under a cedar in their underwear; Dyatlov, Slobodin and Kolmogorova lay between the fire and the tent, as if heading back. All five died of cold; Slobodin also had a skull crack.
T11959 case file: closing resolutionsheets 385–386involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2CNN, 4 Feb 2019T2ABC News (Australia), 6 Feb 2019 - 4 May 1959confirmed
The last four bodies are found in a ravine under deep snow
Dubinina, Zolotaryov, Thibeaux-Brignolle and Kolevatov lay in a ravine about 75 metres from the fire, under 4 to 4.5 metres of snow according to the 1959 file. Some wore clothing cut from Doroshenko and Krivonischenko.
T11959 case file: closing resolutionsheet 386involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2ABC News (Australia), 6 Feb 2019T2CNN, 4 Feb 2019 - 9 May 1959confirmed
Autopsies find crushing chest and skull injuries, and Dubinina’s tongue and eyes absent
Dubinina had ribs broken on both sides and Zolotaryov on the right, both with bleeding inside the chest; Thibeaux-Brignolle had a depressed skull fracture. The examiner wrote that Dubinina’s tongue and eyeballs were absent and put the loss of soft tissue on her face down to decay in water.
T11959 case file: Dubinina autopsysheets 355–357, conclusioninvolved party: Soviet state (Sverdlovsk regional prosecutor’s office)T11959 case file: Zolotaryov autopsyconclusioninvolved party: Soviet state (Sverdlovsk regional prosecutor’s office)T11959 case file: Thibeaux-Brignolle autopsyinternal examinationinvolved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2ABC News (Australia), 6 Feb 2019T1Gaume and Puzrin, Communications Earth & Environment, 2021IntroductionTranslations differThe autopsy says only that the tongue was absent (“Язык в полости рта отсутствует”). Retellings say it was “ripped out” (Snopes) or “removed” (RFE/RL). The English translation on dyatlovpass.com also puts Dubinina’s heart bleed in the left ventricle where the Russian says the right. - 18–29 May 1959confirmed
A radiologist finds beta contamination on some of the clothing, but not in the bodies
Levashov found beta radiation only, up to 9,900 counts a minute per 150 cm² on a brown sweater, which fell by 30–60% after washing; organ samples were at the natural potassium-40 level. He said the clothes carried radioactive dust from the air or from contact with radioactive material.
T11959 case file: radiation testssheets 372–375involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2ABC News (Australia), 6 Feb 2019T2Snopes, 28 Dec 2017 - 28 May 1959confirmed
The forensic examiner says the injuries needed a great force, like a fast car
Questioned by Ivanov, Vozrozhdenniy said Thibeaux-Brignolle’s fracture could come from a car at high speed or being thrown by a strong gust onto rock or ice, not from a simple fall. He said the rib injuries without skin damage looked like trauma from an air blast wave.
T11959 case file: examiner questionedsheets 381–382involved party: Soviet state (Sverdlovsk regional prosecutor’s office)Translations differThe Russian says “воздушной взрывной волне” (an air blast wave). The widely shared English translation renders it “the shock wave of a bomb”, which the original does not say. - 28 May 1959confirmed
The case is closed: an elemental force the hikers could not overcome
Prosecutor Ivanov found no crime and no outsiders, and wrote that the cause of death was “стихийная сила, преодолеть которую туристы были не в состоянии”. Officials at the institute and in sport were punished for poor oversight.
T11959 case file: closing resolutionsheet 387; Russian transcriptinvolved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2CNN, 4 Feb 2019T2ABC News (Australia), 6 Feb 2019T1Gaume and Puzrin, Communications Earth & Environment, 2021IntroductionTranslations differThe Russian “стихийная сила” means a natural or elemental force. It appears as “compelling natural force” (Nature paper), “spontaneous force” (ABC), “spontaneous power of nature” (CNN), “overwhelming force” (dyatlovpass.com) and “unknown, compelling force” (RFE/RL). The word “unknown” is not in the original sentence. - 1 Feb 2019confirmed
Russia’s Prosecutor General’s office reopens a check, saying crime is ruled out
Spokesman Alexander Kurennoi said relatives and the public suspect “something was hidden from them”, and that only three natural versions would be checked: an avalanche, a snow slab or a hurricane-force storm.
- 11 Jul 2020confirmed
A regional prosecutor announces that an avalanche and the cold killed them
Andrey Kuryakov said the hikers left the tent fearing an avalanche in a storm, lost their way in poor visibility and froze. The same Russian state that ran the 1959 investigation ran this review.
T2RFE/RL, 12 Jul 2020T2Lenta.ru, 2 Nov 2020T2TASS, 11 Jul 2020involved party: Russian state (state news agency)T2Komsomolskaya Pravda, 11 Jul 2020 (translation)involved party: Russian Prosecutor General’s Office (its official’s account) - 2 Nov 2020likely
Kommersant reports the avalanche finding was not the Prosecutor General’s official conclusion
It reports that Prosecutor General Igor Krasnov reprimanded Kuryakov because his statements were made for his dissertation, were not agreed with the office and were not the official findings; he then left. Relatives were refused the results and want a murder case.
Sources disagreeLenta.ru quotes Deputy Prosecutor General Igor Tkachev that Kuryakov left of his own accord and that this was not linked to the results of his check. No official text of the check was read. - 28 Jan 2021confirmed
A peer-reviewed study shows how a small slab avalanche could have hit the tent
Gaume and Puzrin model a slab released 7.5 to 13.5 hours after the cut by wind-blown snow, enough for severe but non-fatal injuries. They say they do not explain the radiation, the behaviour after leaving the tent or the state of the bodies.
T1Gaume and Puzrin, Communications Earth & Environment, 2021Introduction; Discussion
Branches
Go down oneA branch is only as strong as its weakest step so far. The count is how many sources back each step.
“An avalanche drove them out”
Did a snow slab slide onto the tent and force them out into the night?
No first appearance was traced. The 2021 paper calls it the “originally popular” theory, and in February 2019 the Prosecutor General’s office named avalanche and snow slab among its three priority versions.
- 288,540 YouTube views, nature video “Explaining the icy mystery of the Dyatlov Pass deaths” as of 12 Oct 2026 T3YouTube: nature video, 2021
- 140,944 YouTube views, EPFL “Using science to explain the mysterious Dyatlov Pass Incident” as of 12 Oct 2026 T3YouTube: EPFL, 2021
They cut into the slope to pitch the tent, which can set off a slab
Gaume and Puzrin show wind-blown snow could have loaded the cut slope until a slab released hours later.
T1Gaume and Puzrin, Communications Earth & Environment, 2021Introduction; ResultsThe premise: confirmedTrue that they dug into the slope: the last photo shows it, and the 1959 file and the 2021 paper both say so. Whether a slab then released is the open question.
T1Gaume and Puzrin, Communications Earth & Environment, 2021Fig. 1 captionT11959 case file: closing resolutionsheet 385involved party: Soviet state (Sverdlovsk regional prosecutor’s office)The worst injuries were crushing ones, with no wounds to the skin
The paper’s simulation of a snow block hitting a person lying on the tent floor gives moderate to severe chest injuries.
The premise: confirmedTrue: the autopsies record rib and skull fractures without external wounds. But the model gives non-fatal injuries, and the 2020 prosecutors’ account puts the fatal chest injuries on a later snow collapse in the ravine.
T11959 case file: Dubinina autopsyconclusioninvolved party: Soviet state (Sverdlovsk regional prosecutor’s office)T11959 case file: examiner questionedsheet 382involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T1Gaume and Puzrin, Communications Earth & Environment, 2021ResultsT2Komsomolskaya Pravda, 11 Jul 2020 (translation)involved party: Russian Prosecutor General’s Office (its official’s account)Avalanches do happen at the pass
The authors report guides’ photos of two fresh slab avalanches on an eastern slope less than 3 km from the tent in January 2022.
T2Puzrin and Gaume, Comms Earth & Env, 2022involved party: Gaume and Puzrin (authors of the 2021 avalanche model)The premise: likelyReported by the model’s own authors from mountain guides’ pictures; no independent survey of the slope was read.
T2Puzrin and Gaume, Comms Earth & Env, 2022involved party: Gaume and Puzrin (authors of the 2021 avalanche model)
- confirmed
Gaume and Puzrin’s 2021 paper says a small slab could have released hours after the cut
Four factors in their model: a locally steeper step above the tent, a buried weak snow layer, the cut itself, and strong katabatic winds piling snow above it.
StartStrength so far:confirmed· 1 source on this step - confirmed
The 1959 search reported no clear signs of an avalanche
The paper lists this among the main arguments against the theory, with the gentle average slope of about 23°. The 1959 file describes the tent as correctly set up and the tracks below it as well preserved.
T1Gaume and Puzrin, Communications Earth & Environment, 2021Introduction; ResultsT11959 case file: closing resolutionsheets 385–386involved party: Soviet state (Sverdlovsk regional prosecutor’s office)= HoldsStrength so far:confirmed· 2 sources on this step - likely
The 2020 prosecutors’ account blames a snow collapse in the ravine for the chest injuries
As relayed by Komsomolskaya Pravda, Kuryakov said the four in the ravine were hit by collapsing snow while sheltering, not by the slab at the tent.
T2Komsomolskaya Pravda, 11 Jul 2020 (translation)involved party: Russian Prosecutor General’s Office (its official’s account)▼ WeakerStrength so far:likely· 1 source on this step - disputed
Key claim: a slab avalanche hit the tent and drove them out
A peer-reviewed model shows it was physically possible; the 1959 search found no clear trace of it, and the prosecutors’ own account does not use the slab to explain the deaths. Neither side has a direct record of the night.
T1Gaume and Puzrin, Communications Earth & Environment, 2021DiscussionT11959 case file: closing resolutionsheet 385involved party: Soviet state (Sverdlovsk regional prosecutor’s office)T2Komsomolskaya Pravda, 11 Jul 2020 (translation)involved party: Russian Prosecutor General’s Office (its official’s account)▼ WeakerStrength so far:disputed· 3 sources on this step
Bullshit meter
- No step is Unverified or Disproven.
- Key claim contradicted by tier 1? No. No tier-1 record contradicts it, but none proves it: a 2021 peer-reviewed model shows it was possible, and the 1959 search reported no clear avalanche signs.
Fluff meter: possibly planted
- Can’t be traced to an original record. Absent: it rests on the 1959 record of the tent site and a 2021 peer-reviewed model.
- First appeared from new or anonymous accounts. Not measured.
- Coordinated identical wording. Not measured.
- Cited source doesn’t exist. Absent: the 2021 paper exists and was read.
- Later contradicted. Not measured: no peer-reviewed rebuttal was found or read.
● present · ○ absent · – not measured. Lists signals only. It never accuses anyone.
Personal interest meter
- Russian Prosecutor General’s Office, is the successor of the office that ran and closed the 1959 case; its regional official announced the avalanche finding in 2020. T2RFE/RL, 12 Jul 2020
- Gaume and Puzrin, wrote both the 2021 model and the 2022 account that reports avalanches at the pass. T2Puzrin and Gaume, Comms Earth & Env, 2022involved party: Gaume and Puzrin (authors of the 2021 avalanche model)
“Has a documented interest” only, each one sourced. Never an implication of guilt.
Correlation meter
- The 1959 radiation test, main timeline step 8, and the UFO, KGB and military branches all lean on it. T11959 case file: radiation testssheets 372–375involved party: Soviet state (Sverdlovsk regional prosecutor’s office)
- Dubinina’s autopsy, main timeline step 7, the Yeti branch (missing tongue) and the avalanche branch (crushing injuries). T11959 case file: Dubinina autopsysheets 355–357involved party: Soviet state (Sverdlovsk regional prosecutor’s office)
- The examiner’s 1959 questioning, main timeline step 9; cited for a blast wave by the military branch and for a fall or gust by the others. T11959 case file: examiner questionedsheets 381–382involved party: Soviet state (Sverdlovsk regional prosecutor’s office)
- The 2020 prosecutors’ account, announces the avalanche finding (main step 12), puts the chest injuries in the ravine (avalanche branch), and rules out the rocket (military branch). T2Komsomolskaya Pravda, 11 Jul 2020 (translation)involved party: Russian Prosecutor General’s Office (its official’s account)
- The 17 February 1959 sightings, main timeline step 4 and the UFO branch; the military theory also cites lights in the sky. T11959 case file: sky sightingssheets 209–220, 227, 264, 266involved party: Soviet state (Sverdlovsk regional and Ivdel prosecutors)
Links to other cases appear once those cases exist.
Who worked on this
This case was assembled by the site from public records. Contributions are not open yet. Nothing here is invented, so the counts are zero.
This is the first published version of the case.
Sources
- T1involved party: Soviet state (Sverdlovsk regional prosecutor’s office) Resolution to terminate the criminal case on the death of the hikers, Sverdlovsk, 28 May 1959, signed by prosecutor-criminalist L. N. Ivanov, agreed by Lukin; criminal case sheets 384–387. Scans, Russian transcript and English translation published by dyatlovpass.com (Teodora Hadjiyska); the original is in the State Archive of Sverdlovsk Region.. dyatlovpass.com · copy read: dyatlovpass.com
- T1involved party: Soviet state (Sverdlovsk regional prosecutor’s office) Act No. 4, forensic examination of the body of Lyudmila Dubinina, 9 May 1959, forensic expert B. A. Vozrozhdenniy, in the presence of L. N. Ivanov; case sheets 355–357. Read in the Russian transcript and the dyatlovpass.com English translation.. dyatlovpass.com · copy read: dyatlovpass.com
- T1involved party: Soviet state (Sverdlovsk regional prosecutor’s office) Forensic examination of the body of Semyon (Aleksander) Zolotaryov, 9 May 1959, B. A. Vozrozhdenniy; case sheets 349–351 (dyatlovpass.com English translation). dyatlovpass.com
- T1involved party: Soviet state (Sverdlovsk regional prosecutor’s office) Forensic examination of the body of Nikolay Thibeaux-Brignolle, 9 May 1959, B. A. Vozrozhdenniy; case sheets 352–354 (dyatlovpass.com English translation). dyatlovpass.com
- T1involved party: Soviet state (Sverdlovsk regional prosecutor’s office) Resolution ordering radiological testing (18 May 1959) and the conclusion of Sverdlovsk city chief radiologist Levashov with answers to additional questions (27 and 29 May 1959); case sheets 370–377 (dyatlovpass.com English translation). dyatlovpass.com · copy read: dyatlovpass.com
- T1involved party: Soviet state (Sverdlovsk regional prosecutor’s office) Protocol of the questioning of forensic expert B. A. Vozrozhdenniy by L. N. Ivanov, 28 May 1959; case sheets 381–383. Read in the Russian transcript and the dyatlovpass.com English translation.. dyatlovpass.com · copy read: dyatlovpass.com
- T1involved party: Soviet state (transcript made by the investigation) Transcript of the group’s humorous leaflet “Evening Otorten” No. 1, dated 1 Feb 1959, as copied into the criminal case; case sheet 31. Read in Russian and in the dyatlovpass.com English translation. The original leaflet is not in the file.. dyatlovpass.com · copy read: dyatlovpass.com
- T1involved party: Soviet state (Sverdlovsk regional and Ivdel prosecutors) Statements on lights in the sky filed in the criminal case: G. Atmanaki questioned by Ivanov, 7–8 Apr 1959 (sheets 209–220); report of meteorological technician Tokareva and station chief Piguzova (sheet 227); report signed Avenburg, Potapov, Sogrin, 31 Mar 1959 (sheet 260); servicemen Savkin and Novikov questioned by Ivdel prosecutor Tempalov, 7 Apr 1959 (sheets 264, 266); clipping from the Tagil Worker newspaper, 18 Feb 1959 (sheet 344). dyatlovpass.com English translations.. dyatlovpass.com · copy read: dyatlovpass.com
- T1Johan Gaume (EPFL) and Alexander M. Puzrin (ETH Zürich), “Mechanisms of slab avalanche release and impact in the Dyatlov Pass incident in 1959”, Communications Earth & Environment 2, 10 (published 28 Jan 2021), doi:10.1038/s43247-020-00081-8. Peer-reviewed, open access.. www.nature.com
- T2involved party: Gaume and Puzrin (authors of the 2021 avalanche model) Alexander M. Puzrin and Johan Gaume, “Post-publication careers: follow-up expeditions reveal avalanches at Dyatlov Pass”, Communications Earth & Environment (published 24 Mar 2022), doi:10.1038/s43247-022-00393-x. The authors’ own account of the reaction to their paper and of later expeditions.. www.nature.com
- T2Mary Ilyushina and Lianne Kolirin, “Russia reopens investigation into 60-year-old Dyatlov Pass mystery”, CNN, 4 Feb 2019. edition.cnn.com
- T2“Dyatlov Pass cold case reopened by Russian police, who say nine skiers died of ‘natural phenomena’”, ABC News (Australian Broadcasting Corporation), 6 Feb 2019. www.abc.net.au
- T2Igor Pushkarev, article on the Prosecutor General’s new check into the Dyatlov case, Znak.com, 1 Feb 2019; read only in the English translation reposted on dyatlovpass.com. dyatlovpass.com
- T2“Russian Officials Reportedly Close Investigation Into Mysterious 1959 Hiking Disaster”, Radio Free Europe/Radio Liberty (Current Time), 12 Jul 2020, citing RIA Novosti. www.rferl.org
- T2involved party: Russian state (state news agency) “Prosecutors say avalanche killed Dyatlov group in Urals in 1959”, TASS (Russian state news agency), 11 Jul 2020. tass.com
- T2involved party: Russian Prosecutor General’s Office (its official’s account) Nikolay Varsegov and Natalya Varsegova, reconstruction of the Sverdlovsk prosecutors’ findings as presented by Andrey Kuryakov, Komsomolskaya Pravda, 11 Jul 2020; read only in the English translation reposted on dyatlovpass.com. It relays the prosecutor’s account.. dyatlovpass.com
- T2Tatyana Drogaeva, “Инициатор расследования гибели группы Дятлова уволен из Генпрокуратуры” (The initiator of the Dyatlov investigation is dismissed from the Prosecutor General’s Office), Kommersant-Ural, 2 Nov 2020 (in Russian). www.kommersant.ru · copy read: dyatlovpass.com
- T2“Стало известно об увольнении расследовавшего гибель группы Дятлова прокурора”, Lenta.ru, 2 Nov 2020 (in Russian), citing URA.RU and Deputy Prosecutor General Igor Tkachev. lenta.ru
- T2David Emery, “The Dyatlov Pass Incident”, Snopes, published 28 Dec 2017, updated 29 Jan 2021. www.snopes.com
- T2Lydia Smith, “Dyatlov Pass Mystery: Rare Wind Phenomenon Caused Madness and Death of Expert Skiers”, International Business Times UK, 3 Feb 2014. www.ibtimes.co.uk
- T2involved party: Russian state (state-owned publisher) Oleg Yegorov, “The Dyatlov Pass Incident: One of the most mysterious tragedies in Russian history”, Russia Beyond (RBTH), 7 Jun 2017. www.rbth.com
- T3Benjamin Radford, “Discovery’s Mountain of Mystery Mongering: The Mass Murdering Yeti”, Skeptical Inquirer, Sep 2014. Commentary.. skepticalinquirer.org · copy read: www.csicop.org
- T3Lev Ivanov (the 1959 investigator), “The Mystery of the Fireballs”, Leninskiy Put newspaper, Kustanay, 22 and 24 Nov 1990; read in the English translation on dyatlovpass.com. A record of his claims thirty years on.. dyatlovpass.com
- T3Richard Holmgren (archaeologist), “The Swedish-Russian Dyatlov Expedition 2019”, essay published on dyatlovpass.com. A record of his katabatic-wind theory.. dyatlovpass.com
- T3“Explaining the icy mystery of the Dyatlov Pass deaths”, nature video channel (Springer Nature), YouTube, published 28 Jan 2021. www.youtube.com
- T3“Using science to explain the mysterious Dyatlov Pass Incident”, EPFL channel, YouTube, published 28 Jan 2021. www.youtube.com
- T3“Hunting The Killer Russian Yeti - The Mysterious Dyatlov Pass Incident”, Discovery UK channel, YouTube, published 29 Dec 2016. A clip promoting the Yeti claim.. www.youtube.com
- T4“THE DYATLOV PASS INCIDENT | Bigfoot? Yeti? Or Something Else? Mountain Beast Mysteries 73”, MountainBeastMysteries channel, YouTube, published 30 Nov 2018. www.youtube.com
- T3“The Strange Deaths Of The 9 Hikers Of Dyatlov Pass”, BuzzFeed Unsolved Network, YouTube, published 15 Apr 2016; its description asks “An expedition gone horribly wrong or proof that we aren’t alone?”. www.youtube.com
- T4“Dyatlov Pass: The Evidence That Changed Everything | Episode 1”, Historyunsealed channel, YouTube, published 26 Feb 2026; it centres on the witness reports of orange lights. www.youtube.com
- T4Goodreads page for Donnie Eichar, “Dead Mountain: The Untold True Story of the Dyatlov Pass Incident” (first published 22 Oct 2013). www.goodreads.com
- T4Goodreads page for Alexei Rakitin (Алексей Ракитин), “Перевал Дятлова” (Dyatlov Pass), 672 pages, listed as first published 2010. www.goodreads.com