As Hydrogen-Bombs, a thousand times more powerful than Atomic-bombs, became the threat; hiding in a corner of the basement for a couple of days was no longer an option. Instead of a bomb, or blast shelter, a true 'Fallout Shelter' which provided shielding against radiation was needed. It was estimated two weeks minimum before fallout 'decayed' to safe levels.
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The Kennedy administration began an all-out campaign to convince suburbanites to built their own private fallout shelters. Often presented as a do-it-yourself addition to the family homestead.
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Above we see the logical exstension of the corner of the basement approach with masonry walls and ceiling thick enough to stop most fallout danger.
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Good thing they've got a ping pong table so that in a week the "rads" will be low enough for a quick game outside the shelter. Are those 5 gal. cans of water? Maybe it's gasoline for burning the neighbors bodies so they don't come back as atomic-zombies. If only the neighbors had listened and built a nice cozy shelter like this!"
