In planning the construction of Auschwitz, the Germans assumed that the camp would eventually hold some 30,000 prisoners. As late as the beginning of 1941, there were no indications that, over the next few months, both the plans for employment and the number of prisoners, as well as the function of the camp itself, would change dramatically. In this podcast we talk about the role played by the German chemical company IG Farbenindustrie in the expansion of the camp, why the Auschwitz II-Birkenau and Auschwitz III-Monowitz camps were established and why the expanding Auschwitz concentration camp also became an extermination camp for Jews in March 1942.