turmoil in the middle east and north africa. earthquakes, tsunamis, a potential nuclear meltdown. they're disasters that have more americans shelling out big bucks to buy doomsday shelters. and these things certainly aren't your grandfather's bunker. >> we got a new contract today. the name of the project is surefire survival community. >> reporter: if you want to prepare for disaster, brian camden is your man. the 55-year-old civil engineer is the owner of hardened structures. he's been in the business of building bomb shelters for 20 years. and right now, that business is booming. >> right now, it's probably a new project every other week. a big cellar is a six-person prefabricated steel shelter that sells for about $36,000.