Nine ski hikers led by Igor Dyatlov died in the northern Ural mountains on the night of February 2, 1959. The group had set up their tent to wait out worsening weather after one member fell ill and could not continue. When rescuers found their tent 18 days later, it had been cut open from inside and the hikers' bodies were found scattered over a wide area, some naked and buried under several meters of snow. The cause of the hikers' deaths remains unsolved despite theories of attack by the indigenous Mansi people, a military experiment gone wrong, or encounter with unidentified objects in the sky.