I'm having a comprehension fail but if your PCs are in Europe you can use Second World War plans as these are perfectly functional designs, just cover exposed concrete with earth mounds and what you can have chain link or slat armour burster armour.
I have a copy of "Civil Defence in Poland" by the CIA, it should be available online as it's declassified but I can't post images out of it on here. However I have posted them over on the Facebook page if you'd like to get them there.
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