My grandparents used to have a very nice fallout shelter in their basement. It was the sample house in a development that they built in the 50s. At the time, the houses were going for $20K and the fallout shelter was a $13K option. Needless to say, nobody ordered the option and only the sample had it. The builder ended up selling the sample to my grandparents without charging them for the shelter.
2 foot thick poured concrete walls and ceiling. Of course if something happened they didn't actually have any food or supplies down there.
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