I think the cost of having that above ground as opposed to a secure underground bunker makes absolutely no sense in our (fingers crossed) global society. It's not something we need to constantly think/worry about and to me, does not constitute enough of a threat.
There was a history channel special about a company that builds huge underground bunkers by assembling big compartments together to form long tunnels which branch out. It's been contracted by the gov't and has built several dozen such bunkers for private use. That makes most sense, imo.
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