A great underground journey with lots of curious info! Thank you for sharing.
As it happens, we just don't know. In case of full-scale nuclear war, the whole of Europe from the Urals to the Atlantic Ocean, would turn into ruins, that's the only clear thing. I also was told that the USSR prepared "a gift" to China as well since WW3 would mean the fall both the West and the USSR, and the Soviets didn't want to leave the world to China as a new and the only dominating power.
But as we see now, having nukes doesn't always mean direct using nukes. If there was a war between the USSR and the West, both sides could restrain from using nukes like Putin's Russia does nowadays using nuclear weapons only as a way of blackmailing and containment to a certain extent although it didn't stop Ukraine from controlling part of Russia. When the war scales are balanced, even old weapons and fortifications are important and can change the course of a war. So... this was my speech to advocate this wonderful fort as a military base. 🙂 Just a speculation. 🙂
Thta's true. Here you can see a tactical map for the battlefield in Germany. No one will get out alive...