On January 25, 1959, a group of 10 hikers sat out in the middle of the Russian winter on what was to be a two-week excursion into the wilderness.

One hiker returned early. The other nine were never heard from again.

Weeks later, their bodies were found. the other nine were never heard from again.

Weeks later, their bodies were found,

and it spawned a mystery that researchers are still trying to solve today.

Learn more about the D'Alve Pass incident

on this episode of Everything Everywhere Daily. The event which became known as the D'Al Pass incident, started innocently enough.

A group from the Ural Polytechnic Institute had planned to go out on an expedition across the Northern

Ural Mountains in January of 1959.

The group was made up of students who had extensive outdoor and hiking experience. of outlaw of. The group consisted of eight men and two women and all of them had

received grade two climbing certification in the Soviet Union and on their

return they would have received their grade three certification. Grade three

was the highest certification possible at the time in the Soviet Union

and required an excursion of at least 300 kilometers or 190 miles.

Their goal was to reach a peak known as Gura or Torton Mountain.

Making the trip in late January and early February was the absolute hardest time of the year to do it.

Temperatures recorded while they were out dip down to negative 13 Fahrenheit or negative 25

Celsius. The group had planned a route on a known trail and filed information about

their trip on January 23rd, the day they left town. The group arrived by train on January 25th to the town

of Ivedel and on January 27th they began their trek. One day later, one of the members of the

group, Yuri Yudin, turned back due to problems with

his knees that prevented him from continuing.

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