After the liberation of Auschwitz, its two main parts - the former main camp (Auschwitz I) and Auschwitz II-Birkenau - were first placed under the control of the Soviet military authorities. In the first of these, from February to September 1945, Soviet field hospitals and the Polish Red Cross hospital operated, where most of the surviving prisoners were treated. A transit camp for German prisoners of war also operated there from spring to autumn of that year. A similar camp existed at the former Birkenau camp until early 1946. Commissions investigating the crimes committed by Nazi Germany at Auschwitz also began to work at the site of the former camp. At the same time, survivors began to make efforts to establish an institution at the site of the former camp to commemorate the victims. Dr Jacek Lachendro, from the Museum Research Centre, talks about the process that led to the creation of the Auschwitz Memorial in 1947.