Where is the proof if any of underground Alien facilities hidden underground in the world?

Question

Where is the proof if any of underground Alien facilities hidden underground in the world?

Answer 1

it's not proven yet and nobody can prove

Answer 2

under the Grassy Knoll

Answer 3

If you wear a tinfoil helmet for a few days to weaken their mind control, you will start to see them everywhere.  But you _have_ to wear it _constantly_.

Answer 4

lol!!!

=]

Answer 5

A.) I can barely understand your question. Perhaps a grammar lesson is in order?

B.) Anyway, I assume that you're trying to ask if aliens host secret alien champagne parties under ground?

The answer is an obvious yes. You haven't been invited to one?