"fall out shelters" 1964 ad....we moved into a house in 1966 that had a fall-out shelter with a square nautilus entrance, two sets of bunk beds, and lots of shelves for food and water, and as privacy corner with bucket and topped barrel for private doings :)
It was recommended that people stay in the shelter full time for at least 14 days after a nuclear blast. Families with children were advised to stock their shelter with recreational materials to break the monotony. Monopoly games were popular. Other suggested items included playing cards and diaries to keep a record of one's stay.