I’ve been to a guided underground tour, which covered a church crypt and a nuclear shelter in my town. I can’t exactly relate to medieval bones, but I feel a strong connection to my country’s Eastern Bloc history, which I can at least remember, hence I loved the nuclear shelter more than the crypt.
The shelter was built in the 1950s to protect about a twenty-five member military operations team in case of the third world war or other emergency. It was completely self-sufficient in terms of electricity, water, heating, ventilation etc. and could maintain the staff for five to seven days.
The bunker, carved underground into a rock, was disused after the dissolution of Eastern Bloc, flooded in the 1990s, offered for sale but nobody wanted it and now remains in disrepair. Also, it’s not much of a nuclear shelter anymore because warfare advanced a bit since the 1950s.