the main line. On 30 September 1943, Hitler met with Albert Speer, the Minister of Armaments and War Production, and Franz Xaver Dorsch, the chief engineer of the Todt Organisation, to discuss plans for a replacement for the out-of-commission Watten facility. Dorsch proposed to transform the Wizernes depot into a vast bomb-proof underground complex that would require a million tons of concrete to build. It would be constructed within a network of tunnels to be dug inside the hillside at the edge of the quarry. A concrete dome, thick, in diameter and weighing 55,000 tons, would be built over the top of the central part of the facility to protect it from Allied bombing. Beneath it, about of tunnels were to be dug into the chalk hillside to accommodate workshops, storerooms, fuel supplies, a LOX manufacturing plant, generators, barracks and a hospital. A standard gauge railway tunnel, codenamed Ida, was to be built on a curving path that would connect it with both the east- and west-bound main line railway, allowing trains to run straight through the complex without needing to reverse or be turned around. This would serve as the main unloading station, where missiles and supplies would be offloaded onto trolleys that would transport them into the connecting galleries Mathilde and Hugo. Hugo connected in turn with Sophie, a dead-end railway tunnel branching from the main line into Ida. Each of the main tunnels had a number of unnamed side tunnels of the same dimensions as the main tunnels and up to long. The central feature of the complex was a huge octagonal rocket-preparation chamber directly under the dome. It was never completed but would have been in diameter and up to high. A number of intermediate floors, possibly as many as ten, would have been built up the sides of the chamber. 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