This article made me ponder the utility of, as a nation, having an independently functioning portion of your economy and society underground at bunker depths, a

This article made me ponder the utility of, as a nation, having an independently functioning portion of your economy and society underground at bunker depths, as a component of national security. If the shit ever did really hit the fan, and you had something on the order of 10+% of your population entirely self-sufficient underground, these would be the survivors and they'd already be entirely acclimated to, and prepared for, the situation. It's some food for thought...