{"The incident remains one of the most chilling unsolved mysteries of the 20th century, as the Soviet criminal investigation in 1959 failed to establish the causes of the deaths. The final report stated only that the people had been killed by an “unknown compelling force.”
The incident has sparked many theories over more than half a century. Some said the group died because of an avalanche, while others blamed secret military tests, an encounter with an unknown creature, paranormal activity or even a UFO."} https://www.rt.com/news/420115-dyatlov-pass-tourist-disappears