Read about this before and it's pretty crazy. It's gonna be on Twisted But True on National Geographic at 10. http://en.m.wikipedia.org/wiki/Dyatlov_Pass_incident#section_4 TLDR: 1959, 9 Russian skiers go missing, died under serious WTF circumstances. Highlights: - Investigators at the time determined that the hikers tore open their tent from within, departing barefoot into heavy snow and a temperature of −30 Â°C (−22*Â°F). Although the corpses showed no signs of struggle, two victims had fractured skulls, two had broken ribs, and one was missing her tongue. Their clothing, when tested, was found to be highly radioactive. All had left of their own accord, walking apparently, all the groupâ€™s belongings and shoes had been left behind.â€ Investigators said the tent had been cut open from inside. - the body of Thibeaux-Brignolles had major skull damage, and both Dubunina and Zolotarev had major chest fractures. According to Dr. Boris Vozrozhdenny, the force required to cause such damage would have been extremely high. He compared it to the force of a car crash. - three bodies could not have been caused by another human being, "because the force of the blows had been too strong and no soft tissue had been damaged". - their skin had a "deep brown tan". - Another group of hikers (about 50 kilometers south of the incident) reported that they saw strange orange spheres in the night sky to the north - The hikers' clothing was found to be highly radioactive.