The claim: Underground city 2 1/2 miles down super computers here beyond your imagination per Dr. Deagle. Colorado Springs, 3,840
What it really is: Schriever Air Force Base is a fairly large Air Force base, with more than 8100 active duty and guard/reserve personnel, civilian employees, and contractors that operate the base.
As for the claims by Dr. Deagle, I find them highly unlikely. Besides the difficulty of going down that deep into the Earth and hollowing out a space large enough for an underground city, the heat that deep down would make it difficult to work in, and would damage these so called super computers.
As for Dr. Deagle himself, well, he promotes a lot of bizarre conspiracy theories and should not be considered a reliable source for anything.