This wasn't the fuel dump mission, it was to some influential person mansion but from your link are you talking about using the backspace key to open door (found through searching for the fuel depot mission topic) or that I'd have to stand somewhere for a certain length of time for it to end? From seeing the diff between when I played the mission but exited it & auto mission, I did kill all the aliens. Just curious so I'll know if this mission comes up again.