In 1959, nine experienced hikers vanished in Russia’s Ural Mountains under circumstances so strange they’ve puzzled investigators for decades. Their tent was ripped open from the inside. Some fled barefoot into the snow. Others showed injuries no storm could explain. In this chilling episode of Into the Unexplained, we retrace the group’s final journey, uncovering the leading theories — from secret weapons tests to the supernatural — and ask: what really happened on that frozen slope?