Friedrich Mennecke, a T4 psychiatrist, wrote each day to his wife Eva, telling her about his work at Sachsenhausen. He was staying at the Eilers Hotel in Oranienburg, in a ‘big and pleasant room’, while his colleagues from Tiergartenstrasse 4 commuted to the suburb each day on the Berlin S-Bahn. His work was ‘very, very interesting’ and he enjoyed afternoon coffee and cake with the commandant. After four days Mennecke and colleagues had ‘processed’ between 250 and 400 prisoners.
