That's kinda a part of the over arching story line. The base WAS once used by a group of people. Not anymore though. (That's why there's a lot of notes and other hiding things within the game about the other people.)
Viewing post in Voices of the Void 0.7 feedback
By the way, yes, I didn't think about it, but still parking in the absence of a normal road to the base (there is only a path) looks strange, and I still don't like the new dark colors
UPD:By the way, I noticed something else, the base is quite black on the outside, and more gray inside, and several different styles are used inside