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OsamaBinNoodles t1_j4tz5y6 wrote

Reply to comment by Desertswisher in TIL about SubTropolis, a giant former limestone mine under Kansas City that was converted into the world’s largest underground business complex. The 1,100-acre complex is accessed through tunnels, and as of 2015, 1,600 people worked there. by corn_dog_22

It’s one of the places the govt uses for storing official documents such as immigration documents. I’ve been down there a couple times, we just call it the caves.

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