How can a bunker protect from a nuclear catastrophe?
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A well-built underground bunker largely isolates you from the blast wave of a nuclear explosion (unless the weapon is designed to penetrate the ground, in which case the seismic waves could destroy it), and all the dirt and concrete block the prompt radiation from the blast. The same dirt and concrete also, assuming you have a good air and water filtration system, block radioactive fallout until it’s decayed to safe enough levels for you to go outside again.
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