D.U.M.B.S = Deep underground facility. Any way this topic is a piece of puzzle.
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When I saw this story years ago I thought it was crazy. I didn’t know anything about DUMBs at the time. Giant toilets down below the Denver airport. Now......ummm....maybe that guy really did get on the wrong elevator. lol
https://youtu.be/iEhkT0KSXMI