New Theory Emerges in Mysterious 1959 Dyatlov Pass Incident

Researchers believe a failed Russian rocket launch may have led to a deadly nitric acid fog, solving the decades-old mystery.

Published on Mar. 8, 2026

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The Dyatlov Pass Incident, a 1959 hiking tragedy in the remote Russian mountains, has long been shrouded in mystery. Nine hikers were found dead under strange circumstances, with unexplained injuries and the official cause of death listed as exposure. Now, new evidence suggests the hikers may have been killed by a nitric acid fog resulting from a failed Russian rocket launch in the area.

Why it matters

The Dyatlov Pass Incident has captivated the public's imagination for decades, with numerous theories emerging about what could have caused the hikers' deaths, including everything from yetis to military involvement. This new theory, if proven true, would finally provide a plausible explanation for the tragedy and shed light on a little-known chapter of Cold War-era Russian history.

The details

Researchers believe the hikers were killed by a nitric acid fog that resulted from the failed launch of an R-12 liquid single-stage medium-range ballistic missile. Witness accounts describe seeing fireballs and unidentified objects in the sky around the time of the incident, and the snow around the hikers' camp was found to have melted in a way that suggested a manmade event rather than a natural weather occurrence. Nitric acid, a highly corrosive substance used as a rocket propellant, can cause confusion, pain, and respiratory issues if inhaled.

  • The hikers set out on their 16-day hike on February 2, 1959.
  • The hikers failed to check in on February 20, prompting a search operation.
  • The hikers' bodies were eventually found near their torn tent.
  • The official cause of death was listed as exposure in May 1959.
  • In 2023, researchers presented a new theory about a failed Russian rocket launch.

The players

Igor Dyatlov

The leader of the group of nine hikers from the Ural Polytechnic Institute who perished in the Dyatlov Pass Incident.

Vladislav Karelin

A 1959 searcher who is now a researcher of the Dyatlov Pass Incident and remembers seeing a fireball in the sky around the time of the incident.

Vadim Skibinsky

A researcher who believes the fireballs witnessed were the exhaust gases of a launched Russian rocket.

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What they’re saying

“Some unidentified object flew from south to north, and then it changed direction and flew from east to west. Only some kind of winged unidentified object could change the trajectory of movement.”

— Vladislav Karelin, Researcher (Russian newsletter)

“The launching—and a subsequent failure—of an R-12 liquid single-stage medium-range ballistic missile resulted in a nitric acid fog reaching the tent.”

— Vadim Skibinsky, Researcher (Russian newsletter)

What’s next

Researchers plan to continue investigating the new theory, including analyzing any available historical records and data related to Russian rocket testing in the area around the time of the Dyatlov Pass Incident.

The takeaway

This new theory provides a plausible scientific explanation for the long-standing mystery of the Dyatlov Pass Incident, moving the investigation beyond the realm of conspiracy theories and into the realm of Cold War-era military activities. If proven true, it could finally bring closure to the families of the victims and shed light on a little-known chapter of Russian history.