- Donnie Eichar said discovered the secret in an interview about his new book
- A probe by the Soviet government at the time was inconclusive, and other researchers have been baffled by the famous case for decades
- Bodies of the experienced explorers were found under the snow
- Some had been unclothed, while their tent was left immaculate except for signs of it having been cut open from the inside
- Interview hints that Mr Eichar's theory may be to do with 'infrasound' - extremely low-pitched noise which studies claim causes irrational terror
A mysterious case of nine experienced skiers who died in bizarre circumstances on an expedition into Siberia may have been solved by an America researcher.
Donnie Eichar, a film-maker and author, spent four years investigating the so-called Dyatlov Pass incident, and has now claimed that he has discovered a 'scientific' explanation for the baffling case.
The skiers, who were all students, were led into the wilderness of the Ural mountains by 23-year-old Igor Dyatlov.
Their aim was to reach the remote Otorten Mountain, but - with the exception of one man who turned back early due to ill health - the entire party would be found dead beneath the snow.
Rescuers sent out into the -24-degree weather to track the party down at first found only a collapsed tent, still filled with all the clothing and survival gear needed to make the rest of the journey.
But the empty tent baffled investigators, as it still contained items of clothing and pairs of shoes - implying that some of the students had ventured out into the wilderness barefoot and without coats.
Even when later searches uncovered the frozen bodies of all nine victims, no convincing explanation could be found for why the experienced hikers - who would have been well-versed in winter survival techniques - had come to such a tragic end.
Search parties found one group of bodies lying in the snow on flat land near a river, a mile from the tent, next to the remains of a long burnt-out fire.
Around 350 yards away lay the corpse of Dyatlov, the engineering student from Ural Polyetchnic who had put the expedition together and was its leader. His name would later be given to the area where the tragedy took place, as well as the incident itself.
Nearby, a search dog sniffed out the remains of Zina Kolmogorova, 22, under four inches of snow, and then that of Rustem Slobodin.
The bodies were in a line 200 yards apart, as if they had been trying to crawl behind each other back up to the shelter of the tent, but never made it.
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