Liquid oxygen
Liquid oxygen was produced at the motor testing facilities at Oberraderach (900 tons/month), in the Redl-Zipf (2,100 tons/month) tunnel (for testing the Linke-Hofmann combustion chambers), and at Lehesten near Nordhausen—two additional underground plants for 6,000 tons/month at Wittringen in the Saar (captured December 7, 1944) and near the Mittelwerk were never completed. In Belgium, an underground plant at Liège (900 tons/month) supplied launches in the Netherlands, and plants at La Louviere, Torte, and Willebroeck were also targets of allied bombing.