Would love to see a documentary on this! Related to that time, there are some fascinating documentaries online that goes through a secret “Regan Vest” facility in the woods (now declassified and a museum) of Denmark that was a nuclear safe facility to hold the royal family and the government in case of an emergency [1]. It was decommissioned only in 2003 and got released from the military in 2012.

[1] https://youtu.be/zSXYApRdw5k?si=Yg5qVphxg8AKJBcl