The US Government top secret underground base at Dulce, New Mexico, is subject for a lot of research papers and sadly a lot of fiction.
The sketch maps below show the true full extent of the bunker and vehicle entrance which is behind a cliff against the river bank. Guard huts give regular foot access.
The base is manned by USAF personnel who arrive by bus in the early hours most Tuesdays and remain underground for two weeks at a time. The bus also brings supplies for the 20 crewmen. The base is connected to the town water and sewage which is why the US Government is on the bill and pays property tax in Dulce!
What does the facility do? If you have any info please contact me here.