Ok, so, in the middle photo they dug down to a depth of 1.5m. But in the photos from the search, there is no trench, the tent is not that deep (it was buried under snow though?)
But, what does this mean? That the middle photo is from some other time? Or other place? The trench was elsewhere?
I never really understood what the Dyatlov group is doing in that photo... it's not the way to set up a tent, and there was level ground not that far away ...they would have to ski back a couple of hundred metres but isn't that better than digging deep, without a shovel?