By the way, I looked at the essence of what they are writing, I will give a few general explanations, regardless of the versions.
About the secrecy of the criminal case. It was indeed classified on July 1, 1959 and formally declassified in 1989. But not completely, fragments of it have been removed, that is, they are still classified.
about the ravine
It seems that some people think of it as a gorge in the mountains. in fact, this is a small washout from the stream that a person can jump over.
what it looked like in 1959

and now


about snow
the wind blows almost constantly in that place and blows the wind down from above. That is, it is easily moved by the wind. If it is necessary to create artificial wind, everything is trivial.

