It is a fact that snow den collapses can cause the injuries seen in the ravine 4.
Do we have similar examples, where snow roofs collapsed and caused injuries alike? But first of all, it is not a fact at all that the ravine had enough snow on February 1st, 1959 to build caves and tunnels. It could have had pathetic amount of snow not able even to cover the stones.
It is highly unlikely that the ravine had a pathetic amount of snow not able to cover the stones.we have several solid examples why this is the case.
1) All the photos of the hikers on their journey.
2) Their descriptions in their diary regarding they way they had to shuttle through the snow at lower altitude because of the depth. The afternoon of the 31st where they sought to find a suitable place to camp with snow at 1.2 meters deep.
3) The depth of the snow on 1079 where the pitched their tent .
4) Ravines by their nature capture the snow where it doesn't get blown away.
5) Recent winter expeditions show the same build up of snow at the same time of year.
6) The trail found by the Mansi that led to the den
7) The snow under the den flooring .
8) The search photos and the searchers needing probes on the slope and forest.
There is snow everywhere, I cannot think of a reason why snow would not gather in the ravine or it being selective. It is a fact that 25 days later , we know that the ravine was covered up to 4 metres .
Giving the above in conjunction with the injuries and the attempts for survival , I do not think it is a huge leap to at least dare to hypothesize that they were making some sort of shelter in the ravine. A shelter to retain heat and stop heat loss is the total priority given the circumstances of not having anything else to stop their demise from the cold .