Mittelbau-Dora (also Dora-Mittelbau and Nordhausen-Dora) was a subcamp of Buchenwald concentration camp in Nazi Germany. Its prisoners were used by the SS mainly in the tunnel excavation and nearby underground stations of the Mittelwerk Ltd., in Kohnstein, situated near Nordhausen, where the V-2 rocket and the flying bomb V-1 rocket was produced.