Could be relevant to this theory, this piece from the book :-
Deev posted his private correspondence with someone under the nickname "Lorelei". Lorelei claimed she heard this story from a man who was in a field expedition near Otorten in 1959: In 1959, he participated in a geological prospecting expedition. ... In mid-January they were sent to the Lozva Valley. Their base camp was located five kilometers to the east of the foot of Mt. Otorten. ... About February 4-5, three of them reached the foot of Mt. Kholat-Syahl. Near the tree line they saw people lying on the snow. They came closer. Five dead bodies lay side by side, exactly five. Without outerwear. What struck them was the color of the corpses' skin. ... It was orange tone with a copper tint. There were many footprints around. Having returned to the base camp, they decided to send a radiogram. They got a reply that the authorities had been informed and the proper measures taken. They were instructed to stay away. The geologists did not follow the advice. They returned. And there were people waiting for them. Right at the edge of the forest. Some tough guys. The geologists were escorted back to the base and questioned. ... Everybody from the expedition had to sign a non-disclosure agreement. ... When they came to the place a second time ... they noticed one thing in the distance - four people on the slope were holding a sort of stretcher, only larger, while two others were shoveling snow onto it, and from the bottom the snow poured as through a sieve. This construction was slowly moving along the slope towards the forest.107
Lobatcheva, Irina. Dyatlov Pass Keeps Its Secret (pp. 133-134). Parallel Worlds' Books. Kindle Edition.