Russia’s Dyatlov mountain mystery unraveled after many decades, unexplained deaths

A series of odd observations during the Dyatlov Pass incident have made it one of Russia's greatest mysteries. It remained classified until the 1970s.

from http://www.firstpost.com/tech/science/russias-dyatlov-mountain-mystery-unraveled-after-many-decades-unexplained-deaths-9251951.html