Kansas underground shelter

Associated Press
Paved roadways lead the way to the Vivos Shelter and Resort during a tour of the facility in Atchison, Kan., Tuesday, June 18, 2013. (AP Photo/Orlin Wagner)

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Robert Vicino is creating what he calls the world's largest private underground survivor shelter --  the Vivos Survival Shelter and Resort -- using a complex of limestone caves dug more than 100 years ago beneath gently rolling hills overlooking the Missouri River. (AP)

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