There were no sanitary facilities except for barrels that served as latrines. Inmates (the majority of them from the Soviet Union, Poland or France) died from hunger, thirst, cold and overwork. During the first months, most of the work done was heavy construction and transport. Only in January 1944, when production of the A4/V-2 began, were the first prisoners moved to the new above-ground camp on the south side of the mountain. Many had to sleep in the tunnels until May 1944.