Nine experienced hikers died mysteriously in the Ural Mountains in 1959

In February 1959, nine Soviet hikers fled their tent in subzero cold, some barefoot, and died of hypothermia and unexplained trauma on a Ural mountainside. Soviet investigators closed the case citing an unknown 'compelling natural force,' and decades of forensic re-examination still haven't fully settled what triggered the panic. Recent studies point to a slab avalanche too small to leave typical debris.

— Donnie Eichar, Dead Mountain: The Untold True Story of the Dyatlov Pass Incident — Chronicle Books, 2013
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