Why does nobody talk about the sealed corridors under Denver's airport?

I flew into Denver last month for a layover and took the train between terminals. Nothing odd there, but I noticed a maintenance door marked 'Authorized Personnel Only' near the A gate. I asked a janitor about it, just casual, and he said those corridors run for miles and are kept at a constant 68 degrees even though they're not used. He clammed up when I pressed further. I've read the whole underground city theory for years, but seeing that door and his reaction made me wonder. Has anyone else spotted staff acting weird about these tunnels, or is there a logical reason they're so secretive?

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1 Comment

adam_robinson1mo ago

Whoa, I had the same vibe there once and a security guy gave me a look that made me drop the whole thing fast.