Fun fact -- the shelters in Montana shown on alpinesurvival.com are from a new-age survivalist cult (http://en.wikipedia.org/wiki/Church_Universal_and_Triumphant...). I know this because I grew up in it, and actually lived on the street shown in the photo. Everybody sunk their life savings into them and racked up the credit card debt in the late 80s. Yes, connected to the cold war, but for larger "karmic" reasons of course. You should thank them though, it was only through their prayers that nuclear war was averted! Needless to say, most people didn't believe that, and membership collapsed after the Berlin Wall fell. The shelter at CUT's headquarters reportedly was able to have hundreds of people live for decades, and was the largest private shelter in the US. A whole new level of crazy, folks.