SubTropolis is a 55,000,000-square-foot (5,100,000 m2), 1,100-acre (4.5 km2) artificial cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility. Developed by late Kansas City Chiefs owner Lamar Hunt via Hunt Midwest Real Estate Development, Inc., it has trademarked the phrase World's Largest Underground Business Complex.
Dug into the Bethany Falls limestone mine, SubTropolis is, in places, 160 feet (49 m) beneath the surface. It has a grid of 16 ft (4.9 m) high, 40 ft (12 m) wide tunnels separated by 25 ft (7.6 m) square limestone pillars created by the room and pillar method of hard rock mining.[1] The complex contains almost 10.5 miles (16.9 km) of illuminated, paved roads and several miles of railroad track. Currently, more than 7,300,000 square feet (680,000 m2) is occupied and 6,700,000 square feet (620,000 m2) are available for future expansion.
The mine naturally maintains temperatures between 65 and 70 °F (18 and 21 °C) year-round. The United States Postal Service and the United States Environmental Protection Agency lease spaces within SubTropolis, the United States Postal Service for its collectible stamp operations and the U.S. Environmental Protection Agency for their Region-7 Training and Logistics Center. The National Archives and Records Administration also leases space for a Federal Records Center.
Thanks for the link, Mary
Source: Wikipedia
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