No, that's the south end. It's north
Yeah you're right. I had the area in mind correct, but for some reason I kept thinking that the large door on the north part of the bottom floor of the tank hangar is the same as the main door leading inside. However, I understand that it's not.
Will simply try to look for the elevator there. I wish I could boot up the game now but my brother is using the PS3 at the moment.