It's the aliens, Unexplained deaths

Dyatlov

In the late 1950s, a group of Russians who were very experienced ski-hikers were discovered to have died on the slopes of the Mountain of Death, some of them frozen to death and others dead from massive physical trauma. They left their camp in the middle of the night, some without clothing or shoes, in sub-zero weather. What terror caused them to flee to their deaths?

Some of our research:
A practical review
Crackeds’ take on things
Wiki post

It's the aliens, Unexplained deaths

ufovanish

On October 21, 1978  20 year old Frederick Valentich piloted his Cessna across the Bass Strait. He and his plane were never seen again but the final six minutes of his life were recorded in a conversation with the airport tower. The recording and transcript of that conversation have sparked a controversy that is still unsettled today.

Some of Our Research:
Conversation reenacted
An overview with aliens
More of a hoax than anything else?
Pilot error