With the beginning year 1944, with much more allied air attacks, targeting the german armament industry, it was made the plan, to move parts of this industry in the deep tunnels of „Hartsteinwerke Vulkan", to protect them against this air attacks. For this reason in April 1944 the company area of Vulkan was confiscated by the „Reichsministerium für Rüstung und Kriegsproduktion". By order of Reichsluftfahrtministerium, the company „Mannesmann, Stahlblechbau A. G., Berlin" should move to the „Vulkan" near Haslach, to produce there, after reconstructing the tunnels, in an area of 18000 qm V-Weapons. With that the connection between the main-plant and the moved part-plant of Mannesmann did not become known, the Rüstungsamt in Berlin gave order, to use the Codename „Barbe" for the part-plant in Haslach. Also the Messerschmidt - Flugzeugwerke, who build in 1943 the first Jet-fighter, and had been bombed constantly by the allied, had been very interested at this underground production place. Representatives of Messerschmidt in April 44 inspected the underground tunnels of „Vulkan". In Mai 44 a construction staff of the Reichsluftfahrtministeriums, the Ingenieurbüro Schlemp, came to Haslach, to prepare the tunnels for the development. To this time, Mannesman should move in. One month later Organisation Todt took over the site management. Two builders and constructor companys became order from Organisation Todt, Berlin, to redesign the underground quarrytunnels to production plants. They was the Firma Wayss und Freytag A. G., Frankfurt, Niederlassung Straßburg as well as the Firma Dohrmann, Mühlheim. For a quicker realization of the building project, KZ Prisoners were made avaiable to this two building companys. Along the Reichsstraße 294 (today B 294), in the latitude of the accessroad to the quarry, Organisation Todt would build in autumn 44 a large work camp with 14 lodging hats for the prisoners. The quick progressive warevents let this project fail. Instead of this, the SS in August 44 in a large storeshed of the german armed forces near the sportsground Haslach established a KZ., which had been an outcamp of KZ Natzweiler (Elsaß). This camp was called „BARBE", also had been called often „Camp Kinzigdamm". Average 600 Prisoners from the KZ Struthof-Natzweiler and Dachau had to live there crowded together. Mainly french resistance fighters, but also people from Germany, Belgian, Luxembourg, Poland and Russia. The KZ near the sportground was surrounded by barbed wire, and guarded by 30 SS Soldiers. The Prisoners, under guidance of the Org. Todt, were employed with the tunnel extensions for Mannesmann. After a testimony of a witness of the Rastatter KZ-Trial , who had worked in camp „Kinzigdamm" as a writer, in Nov. 1944 192 prisoners died because of dysentery. At 10. September and 3. October 1944 the branch Gaggenau of the Daimler-Benz-Werke to 80 percent had been destroyed by allied airplanes. Now the Rüstungsamt Berlin decided that not Mannesmann, nor Messerschmidt, but a production part of Daimler Benz, which produced crankshafts, should move to Haslach. The Rüstungsamt Berlin now called for the competion of the tunnels, that plant Geggenau could move in. (Daimler Benz could never begin production in the tunnels; after installing the machines, an allied airattack in March 45 destroyed the power supply). Dependent on the high mortality of the prisoners, the work had come in delay; in order of the chief of the Sicherheitspolizei in Straßburg, Standartenführer Dr. Igelhorst, in November 44 further 650 prisoners, most ly resistance fighters from Elsaß, moved from KZ Vorbruck-Schirmeck in Elsaß to Haslach, to carry out the order by the Rüstungsamt for a quick tunnel completion. Because of the raging dysentery, no more prisoners came to camp „Kinzigdamm". The commander of KZ Schirmeck, Karl Buck, gave order, to put all new prisoners in one of the „Vulkan" tunnels. Now the „Vulkan" became the „Hell of Haslach". The outbreak of epidemic typhus quickly increased the number of dead prisoners. Altogether in KZ „Vulkan" more than 100 prisoners came to death. The „Vulkan" prisoners stayed up to 28. March 45 in their underground Prison. Then, for about 1 month, they came to the, meanwhile leaved, Camp at the sportsground. Here they have been liberated by french Army at the 21. April 45. The by prisoners leaved tunnels became used by residents of Haslach in the last days of the war; A rumour said, it would be planed, to defense Haslach. Thad did not happen, and at 21. April 45 tanks of the french army reached Haslach without any fight. After the war, in Mai 45, all machines and devices of Daimler Benz and Organisation Todt were confiscated by the french military gouvernment. In June 45 the company „Hartsteinwerke" applyed for resumption of the business. That was authorizated in August 45. But they could not start, because the area of „Vulkan" was closed by the french army, and guarded. In the course of the Rastatt Trial the blasting of the tunnels was decided. With 64 tons of explosives in November 1947 the first explosion was released; without any success; the tunnels were well as before. It was decided, to make a second blasting. Now 84 tons of explosives were used, together with large quantitys of ammunition of the war, as bombs, grenades and so on, which had been put into the tunnels. At 28. April 1948, 16.30, this enormous amount of explosives were released. The whole middle Kinzigvalley was shook, and over the area of "Vulkan" a large cloud of smoke stood. This was the end most of the tunnelentrys.