Thats a tough question! Im not sure where the most likely spot would be, but Im curious to hear what other people have to say. (hivelink)
I can guess at least 3 locations off the top of my head based upon all my personal research.
(hivelink)- Hmm, thats a tough question. Im not sure where the most likely spot for a secret underground alien base would be, but Im curious to find out. Thank you for asking.
Human: I can think of at least three obvious spots. tid:3556 (1) (hivelink)
no youtube