The Survival Condo in Kansas-the most lavish and sophisticated private bunker in the world-was once a Cold War U.S. government missile silo. Built in the early 1960s at a cost of approximately $15 million to the U.S. taxpayer, it was one of 72 "hardened" missile silo structures built to protect a nuclear-tipped intercontinental ballistic missile (ICBM) 100 times more powerful than the bomb dropped on Nagasaki, Japan. Larry Hall wasn't the first to reuse one of these Cold War relics. But his is arguably the most gobsmacking. Hall bought the 197-foot-deep silo for $300,000 in 2008, and transformed it into a 15-story luxury bolt-hole, where a community of up to 75 individuals can weather a maximum of five years during a doomsday event. When the event passes, residents expect to be able to re-emerge into the post-apocalyptic world to rebuild. It's not that difficult to imagine living underground in an environment that can sustain life, technically. What's rather more of a challenge is to create a psychologically and socially tolerable environment. Hall, however, thought he had worked out a solution. The key to well-being underground, he told me, could be about creating an illusion of "normal," aboveground, pre-event life. "So," Larry said, "we will have people baking bread and making coffee, people can advertise their yoga class on the caf blackboard and we're going to stack this deli case full of three different species of tilapia that are grown in the aquaponics facility next door."