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I've come up with a workable theory, namely the Dyatlovs were killed by attackers.
A guy at Serov railway station claimed they'd stolen his wallet, he called the police but he couldn't prove it so...

You're probably familiar with the incident, 9 Russian hikers in the Urals in 1959 slashed their way out of the tent and ran almost a mile down to the trees partly-clothed in subzero snowy conditions...