Air raids during that year had also burned down Döpel's institute apartment and Heisenberg's house in Leipzig. Sixteen months later, on April 6, 1945, just 32 days before the surrender of Germany, Klara was killed in an air raid, while she was working in the physics building. In Russia Near the close of World War II, the Soviet Union sent special search teams into Germany to locate and deport German nuclear scientists or any others who could be of use to the Soviet atomic bomb project. The Russian Alsos teams were headed by NKVD Colonel General A. P. Zavenyagin and staffed with numerous scientists, from their only nuclear laboratory, attired in NKVD officer's uniforms. The main search team, headed by Colonel General Zavenyagin, arrived in Berlin on 3 May, the day after Russia announced the fall of Berlin to their military forces; it included Colonel General V. A. Makhnjov, and nuclear physicists Yulij Borisovich Khariton, Isaak Konstantinovich Kikoin, and Lev Andreevich Artsimovich. Döpel was sent to the Soviet Union to work on their atomic bomb effort. At first, he worked at the Nauchno-Issledovatel'skij Institut-9 (NII-9, Scientific Research Institute No. 9), in Moscow. There, he worked with Max Volmer on the production of heavy water. In 1952, he became a regular professor of experimental physics at the university of Woronesh. In 1954, he married the Ukrainian Sinaida Fedorowna Trunowna, widow of a Soviet officer that had died in World War II. Back in Germany Döpel returned to East Germany in 1957, together with his wife. He became professor of applied physics and director of the Institut für Angewandte Physik (Institute for Applied Physics) at the Hochschule für Elektrotechnik (today the Technische Universität) Ilmenau. There, he conducted spectral analysis of the mechanism of electric discharges in gases. Later on, he was engaged in energetics in connection with waste heat and global warming problems. With his zero-dimensional climate model, he estimated global warming contributions from waste heat for coming centuries which have been confirmed meanwhile by more refined model calculations. He died in Ilmenau in 1982. In honour of his 100th birthday in 1995, there were solemn colloquia at the Universities of Ilmenau and of Leipzig. Internal reports The following reports were published in Kernphysikalische Forschungsberichte (Research Reports in Nuclear Physics), an internal publication of the German Uranverein. The reports were classified top secret, they had very limited distribution, and the authors were