Coby Cullins stands next to a scale model of the Vivos Shelter and Resort during a tour of the facility in Atchison, Kan., Tuesday, June 18, 2013. A California man is creating what he calls the world's largest private underground survivor shelter, using a complex of limestone caves dug more than 100 years ago beneath gently rolling hills overlooking the Missouri River. (AP Photo/Orlin Wagner)

Associated Press
Coby Cullins stands next to a scale model of the Vivos Shelter and Resort during a tour of the facility in Atchison, Kan., Tuesday, June 18, 2013. A California man is creating what he calls the world's largest private underground survivor shelter, using a complex of limestone caves dug more than 100 years ago beneath gently rolling hills overlooking the Missouri River. (AP Photo/Orlin Wagner)
Coby Cullins stands next to a scale model of the Vivos Shelter and Resort during a tour of the facility in Atchison, Kan., Tuesday, June 18, 2013. A California man is creating what he calls the world's largest private underground survivor shelter, using a complex of limestone caves dug more than 100 years ago beneath gently rolling hills overlooking the Missouri River. (AP Photo/Orlin Wagner)
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