How would you go about building a doomsday bunker? What is the expert's advice on what type or kind of doomsday bunker can protect you from some world-wide disaster or catastrophe? What kind of material should it be made out of?
I think, the materials should be natural otherwise, it'd be very expensive to build it using cement bcz you will need a thinkness of more than two meters to protect you from radiation or other hazards! To resort to a deep cave is the best solution. At lease this is what I'd do.
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