The kicker is that DARPA needs an answer quickly -- it only posted the notice on August 20th, and any evil geniuses tunnel owners have until August 30th at 5PM Eastern to offer their spaces.

And of course, DARPA hasn't said just why it needs this area to begin with. A lair for a Demogorgon? An Us-style tunnel? An area to conduct alien autopsies? The boring reality is that it's probably meant for non-sinister purposes like studying radio waves, but that isn't about to stop people's vivid imaginations -- we've seen a few sci-fi horror movies start out this way.