OMG I keep reading the title as doomsday PEPPERS
I keep reading it as Doomsday Preggers which makes me laugh every time.
I live across the street from a bomb shelter under I-5. My emergency plan involves some bolt cutters and a new lock.
I said that to the missus before this thread.

I was like: "Oh look he lives near a fallout shelter" We like to play a game of zombie survival with google maps. Take a random address (in this case we used someone else's) get a dice and roll. Thats how many moves you get and for every move it costs you 15 minutes. The clock always begins at 12 noon. The goal is to find a hardware store, grocery store, costco, or safe haven before night fall at 7pm. Its fun as hell to play in street view like that. Most of the time I win, I have a great sense of direction.
As for the preppers themselves I know a few back home in fresno. They are perfectly normal people till you start bringing up stuff like bio terrorism or global warming. I don't think the rationale behind some of it is healthy, but I think whatever gets them to sleep at night is ok cause I know where they live in case of an emergency.
There are several large nuke shelters in the bay area and an old run down presidential bomb shelter in San Francisco from the 50's. I went on a tour of them a few months ago, it was very surreal. I found the tour from a local urban spelunking group. I wish my phone could have taken better photos, it was awesome. Just to think there are several oval offices around the states prepared for when the worst happens.