yes, Nigel, you are right. But it still not make it possible that it reach the pass.
The Kobanya cellar system wasn't discovered by the occupying Russians FWIR. Another might be Weingut. There were many other underground factories that remained hidden (and many that are still hidden today).
Kobanya cellar was constructed in XII century, nobody was building it during the war time, just place factory inside. There was lots of military factories everywhere during the war time.
Building any underground facility for SAMs at the late 50s, even reconstructing existing one will require enormous amount of work that will be noticed.
Sequence of bomb damage is: airburst, heat wave, fallout. Airburst travels at speed of sound, heat wave somewhat slower, fallout depends on the load. In any case, the fallout would begin in maybe 30 seconds - 1 minute after the airburst (considering an airburst at 1km above ground).
So how far they could run from tent during 1 minute(including exiting the tent)?
Alecsandros, If you want make any theory reliable you must accept existing facts, if you start creating many different theories to support your theory it will become very very unlikely to happens.
The fact is that Dyatlov Pass could be reached in that times only by ballistic missile, no need to imagine some secret underground bases in Ural Mountains.
Another fact is that explosion of live warhead will very unlikely force them to run as far as to the forest (to get to the forest they need minimum 30mins)
So there is definitely something missing in the rocket theory.
I have some theory that this tragedy was started by incident with missile and military involvement but just need a bit of time to make full research about it