The first group of 107 slave laborers arrived at the Mittelwerk in late August 1943. They came from the Buchenwald concentration camp, located fifty miles to the southeast. The wrought-iron sign over the Buchenwald gate read Jedem das Seine, “Everyone gets what he deserves.” Digging tunnels was hard labor, but the SS feared prisoners might revolt if they had mining tools, so the men dug with their bare hands.