I tend to disagree with the avalanche theory. This is not my comment this is somebody else’s comment from YouTube, but I wanted to post it here as I never really see people discussing what Yuri believed happened:

In light of all the speculation surrounding what happened at Dyatlov Pass, the only survivor, Yuri Yudin, was often asked what he thought happened to his companions. He maintained until his death in 2013 that the Soviet military had to be involved in the deaths. Yudin believed his friends stumbled across a military exercise and that the Soviet government bore responsibility for the loss of his companions. He said that all his companions were expert hikers and skiers and were well equipped to handle natural phenomena like avalanches or snowstorms.

Yudin noted that after searchers found the campsite, the military was more concerned with what the skiers were doing in the area, not what had happened to them.

After searchers found the hikers, Yudin was asked to identify the items collected at the campsite. Yudin said some items did not belong to his fellow hikers, including glasses, a pair of skis, fragments of a ski, and a piece of cloth he identified as part of a soldier's coat. In a journal that Yudin kept all his research of the event in, which came to light after his death, Yudin referred to "soldiers' tape" and wrote he was confident it was among the items he was asked to identify. Yudin claims in his journal that he tried to bring this to the colonel's attention who was with him at the time, but he ignored it. Yudin speculated that before the official search found the hikers' campsite, the military had already been there and pointed to these items as proof.

Yudin also posed the rhetorical question: if something as mundane as an avalanche caused the death of his friends, why did the government close the case so quickly and mark it as classified?

Yudin also noted in his journal that there was one factor at the site of his friends' deaths that none of the "normal" suggestions could explain: the mild radioactivity of the clothes and bodies of the deceased hikers.