When ten Russian hikers embarked on a once-in-a-lifetime journey in January 1959 they had no idea that the events that they would encounter would give rise to a number of 60- year-old conspiracy theories. The Dyatlov Pass Incident, so named for the 23-year-old leader of the expedition, involved mass psychosis, ice slabs, nuclear radiation, UFOs, and a Yeti. You heard, it has it all. And even today it is still one of history's greatest mysteries.

Welcome to part one of the Dyatlov Pass incident.

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