The Dyhernfurth complex was a sprawling, state-of-the-art production plant. Speer’s Armaments and War Production Ministry had paid Farben nearly 200 million reichsmarks to build and operate it. The facility had been secretly and skillfully designed and managed by Otto Ambros. As he had done with IG Auschwitz, Ambros had overseen every element of this chemical weapons factory dating from the winter of 1941,
