In Soviet times it was a super-secret missile base
My travels to the military base "SS-18 "Satan".
The missile weighs 211 tons, 34 meters in length and 3 meters in circumference. Maximum range – 15000 km Inside 10 warheads with an explosive equivalent of 750 kilotons of TNT each.
Lid mine weighs 120 tons, it fully reclines just 8 seconds."
The mine is very difficult – 12 floors of any equipment, of which only the two lowest housed the military – duty part.