SubTropolis in Kansas City, Missouri, is one of the world’s largest underground industrial complexes, developed from a limestone mine in the 1960s. Spanning over 6 million square feet, it offers natural insulation and constant temperatures, making it ideal for secure document storage, data centers, and temperature-sensitive industries. It exemplifies how subterranean spaces can be repurposed for efficient, sustainable use. Deep underground bases (DUBs) serve strategic purposes, particularly for
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