I believe the underground base does exist. But it's purpose other then our own government creating a sustainable underground civilization, in the event of the worst case scenario and possibly some highly restricted scientific R & D going on as well. But aliens, reptoids, and our government of humans all working/living together down there is a stretch. As for cloning experimentation I wouldn't put it past the CIA to create lifeforms that may be mistaken as ET's but were created here.
I dont know but that would be scary o_O all those humanoids. Aliens and clones.... its real weird. Who really knows. There seem to be some guards and workers that came out and said things...but who knows
Supposedly they have a nightmare hall where they experiment on people and mess with genetics( maximum ride much?) and other weird shiat that is too crazy to believe.
That would be crazy if it were, though wouldn't be surprised... who knows what their doing down there... So curious!