The secret of the Pass of Dyatlov. In 1959, in the mountains of the Northern Urals, a catastrophe occurred that caused the death of nine Soviet skiers. The facts around their deaths had the stamp “Top Secret”. Young people were students of a ski expedition led by Igor Dyatlov. When they did not return home, their families became worried. The search operation began. The camp of Dyatlova was discovered on 26 February. The tent in which the detachment lived, was torn from the inside, shoes and personal belongings were found there. The bodies of people were found in the vicinity, with almost no clothes on them. Operatives found on the clothes traces of high radiation, and five bodies had an orange “tan”. Tourists who were nearby, reported that they saw strange balls that flew in the immediate vicinity of the campsite Dyatlov.