The Neuengamme subcamp A1 in Lengerich was erected between March 1944 and June 1944.1 Members of the Organisation Todt (OT) as well as concentration camp prisoners and civilian workers constructed the camp. Prisoners and civilian workers arranged the work area, a tunnel, for armaments production. The building foreman operated a tiling business in Münster.2 The subcamp is mentioned for the first time on March 26, 1944, in the concentration camp death lists. The closed old railway tunnel on the line from Münster to Osnabrück was the deciding factor in the decision to construct a subcamp in Lengerich. Because of the tunnel, it was possible to relocate armaments production underground, thereby giving protection from possible Allied bombing attacks. The prisoners in Lengerich were “political” prisoners, “protective custody” prisoners, and forced laborers. The prisoners were accommodated in a hall of the Brunsmann Inn, Horst-Wessel-Strasse 15 (later Lienener Strasse 15), about 2 kilometer...