The Atchison Storage Facility, commonly known as the "Atchison Caves" is a 2.7 million square foot underground storage facility in a former pillar limestone mine below the ground in the Missouri River bluffs at Atchison, Kansas. The bunker complex was a secure U.S. government storage facility from World War II until 2013. In April 2013 it was privatized and sold to a private investor from Springfield, Missouri. The proposed uses of the facility include storage, miscellaneous business uses (Mo-Kan Underground Business Center and Citadel Caverns), an amusement complex (Extreme Underground) and a doomsday bunker (Vivos Survival Shelter and Resort).