It's my basement. A foot of brick over top of me... all other answers are your basic basement bitch dimensions. I'm out in the country... fallout is the only concern.
the reason i ask is because civil defense used to publish guidelines as to how much depth you needed for certain materials to be safely guarded against everything from blast to fallout. i would be mostly concerned with contamination of water and wildlife, plus air quality.
What about when your brick fort is full of fecal matter, urine, the food is rotting and you have no access to water, heat or refrigeration since the grid will be out and plumping and power won't be functioning... that is, assuming the brick fort has refrigeration, electricity, plumbing and generators that somehow work in a basement covered in debris.
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