The underground tunnels of SubTropolis have been around much longer than the companies housed inside of them. During the 1940’s, miners started work on a 270-million-year-old limestone deposit, called Bethany Falls. This process resulted the 55 million square-feet mined out of the Bethany Falls layer, with 14 million square-feet usable for underground industrial space. The miners then recycled the deposits. These deposits eventually helped to create the tarmacs at the Kansas City airport, and were used to pave Interstate 435
https://www.stolenhistory.org/threads/kansas-city-subtropolis.2025/
https://www.classicdigest.com/de/readers-stories/show-ad-detail/Americana/589/2677
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