The western side of the chamber opened onto two tall passageways, opening onto two tracks to the outdoor launchpads, with the tracked passages and launchpads named "Gustav" (the southerly-located pad) and "Gretchen" (the northerly-located pad), both on the western side of the domed complex. Each was to have been protected by bomb-proof doors made of steel and concrete. The passageways were to be wide and at least high and were angled in a Y-shape, both exiting westwards into the quarry. The outdoor launchpads for the V-2 rockets would have been at the end of each passageway. The two passageways were angled at 64° 50' and 99° 50' west of north respectively—not aligned with any probable target but merely permitting the rockets to be transported to either one or the other, of their pair of sufficiently-separated launch pads.