On a hiking trip in Russia's Ural Mountains in 1959, nine young mountaineers tore their way out of their tent in the middle of the night and went running into the wilderness, half-clothed and without shoes. By morning, they were all dead—some from hypothermia, others from unexplained catastrophic injuries. To this day, no one knows what happened. To view this episode’s full list of sources, please visit parcast.com/supernatural