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Funny story, my dad built a bomb shelter in his house, the one I grew up in. While it was not elaborate (concrete reinforced box in the ground with trap door, and pipes for water and air to be filtered), it was nice in a tornado. <snip>
Not so funny. My Father (a former Airman) and Grandfather (and I, age 12) built a duplex on 30 acres in Essex Center, Vt. in 1963. Basically downwind of the Plattsburgh SAC base, which was a high priority nuke target.
They included a "bomb shelter", about 20' long x 10' wide x 9' high. Double concrete block thick (w/ holes filled w/sand), ceiling about 8" of concrete, acted as base for front porch.
One of my more memorable jobs was filling the blocks with sand. Towards the top they ran a ramp made of 2x6's across the top, we'd wheel a big wheelbarrow filled w/sand, I'd scoop sand and pour it down the holes.
I can still see that wheelbarrow tipping over and crashing into the hole.
I still have the wheelbarrow.
Fortunately we only used the "bomb shelter" as:
(first) emergency ration storage, with a few bunks, with several drills a year hunkering down for a day
(second) cold cellar, until they built a much bigger one
(third) worm breeding farm,