Only three such facilities were located in Poland, abandoned by Soviet soldiers in 93-94, kept a closely guarded secret from the 70s to the 2000s.
The number of warheads and their destructive power was incomparably greater than the equivalent of what fell on Hiroshima and Nagasaki. The amount in each of the three warehouses was enough to turn Europe into a nuclear desert for many years.
Interestingly, each satellite country, i.e. Poland, the GDR, Czechoslovakia, Bulgaria, etc. had such warehouses on its territory. In the event of a nuclear conflict, it would not be the Soviet Union that would be the target of the attack, but the neighboring countries on whose territory such charges were located.