Impressive. However, the first thing that comes to mind is "where do the data links exit the bunker, physically?" What good is logical redundancy if all the optical links are physically located next to each other? [Enter fiber-seeking backhoe]<p>Also, what good is a blast door if the links aren't blast-proof when on the outside? All that gets you in the case of a strike is a bunch of unreachable servers, although still possibly functional.