Cold-War era strategic Autobahn segments in West Germany had covered shafts at regular intervals.Rumors had it that they were supposed to be fitted with small tactical nukes in the case the Sowjet tanks were on the verge of crossing the border...
Edit:Found the relevant Wikipedia article (only in German, though...):https://de.wikipedia.org/wiki/Zebra-Paket






Schöner Beitrag, fand ich gar nicht so sehr cringe, eher positiv begeistert.