I cba to fill this page with information, it's just 4 pics. What more do you want to know?
And before you ask silly questions about Area 51's location, this isn't the outpost in Nevada. This is a generic military outpost, with Area 51 underneath it. Accessible via the storage hangar, in case you hadn't figured it out.
And this mod is NOT based around Area 51, that is just the opening section.