First of all I would like to dedicate this theory and my views to the 9 tourists, their families,mall those unfortunate enough to have suffered the loss of these fine young men and women. I would also like to send my condolences to the Russian people.
What happened on the pass was an accident and a tragedy.
The Dyatlov group were in the wrong place at the wrong time.
So here goes.
Many of you may be familiar with my "low yield nuclear test" hypothesis. Well I believe that the Dyatlov group unintentionally did get caught up in some kind of military test, which could well have been a low yield device. But it was not the device itself that caused the demise of the group.
It was the test subjects that were used as a part of the test. These were most probably fully grown adult male Chimpanzee(s) or Moutain Gorilla(s).
There was likely a lot of military activity in the sky around the mountain that night. This would havE included dropping the test subjects off on the site. The test subjects were probably being used to understand the effects of the weapon and to gauge these effects on humans. Probably to understand the effects in the war theatre.
Somehow, these test subjects escaped from whatever confinement they had been in. Note that these animals can bend iron bars with their bare hands. They had probably already been exposed to whatever test had been planned. They were probably contaminated with radiative material,mother were probably injured and hurting and frightened. That made them exceptionally dangerous.
When they first approach the tent. The group were probably not that scared. They may have even been interested in seeing the cute chimps, and decided to take some photographs. Semyon grabbed his camera. But then things took a sudden turn for the worse and the animals became aggressive and attacked one or more of the group. Initially the attacks would have been brief running and jumping at the group members. Some of the group members fought back hence the evidence of the brawling. The level of aggression escalates. These animals are significantly stronger than humans. Some of the group run inside the tent, and an ape blocks the entrance so they try to cut the fabric of the tent, and maybe even escape through the larger 86cm hole. The group slowly and cautiously move away trying not initiate any further aggressive response from the apes.
The group slowly decent the slope, with no gear and in most cases no shoes.
The ape(s) follow cautiously behind them. Note that a chimps bare foot doesn't look that much different from a humans, unless you look very closely and you are an expert you might never notice the difference.
They get to the cedar and they scramble up to find safety. Some pull off the smaller branches so that can look up the slope towards the tent and the ape(s) to see what it/they are doing. Yuris D has sever frost and clings on for dear life. Yuris K is not in much better shape. Some decide to collect fire wood on the tree and then climb down to build a fire while other stay on the tree to keep watch. The two Yuris are in a bad way and by the time the fire is lit they haVe already lost too much body heat to survive - even with the fire.
Rustem may not have made it all the way down the slope. His head injury is consistent with an ape attack. Knocked to the ground, pulled around by the legs, and beaten severely. An ape can easily cause those injuries.
The two Yuris at the cedar die, and the others sadly remove their clothes to survive. It's possible that 9 may have split up into smaller groups on the pass. The tab 4 remove the clothes of the Yuris and start to build a shelter or a hide out, but the apes find them and attack. Thibo, Lyuda and Semyon's injuries are all consistent with the same pattern of attack. Knocked to the ground, pulled and dragged around - in Lyuda case very violently hence all the tissue loss on her face. Same for Semyon. The fractured ribs are consistent with massive blows from a very powerful animal. But I have done the calls and these animals can do this. This is why they camera was left around Semyon's neck. The knife they had was probably embedded into one of the apes in an attempt to defend themselves. I can't say what happened to the apes afterwards
Zina at some point was obviously side swiped by one of these apes at some point but later died of hypothermia.
Dyatlov got away and died of hypothermia.
The apes were probably tracked down and disposed of.
Apologies for the lack of detail, but I don't have much time at the moment.