The Soldau concentration camp opened in September 1939.[5] Also in September, the Stutthof concentration camp was built, with 40 sub-camps set up contingently for maximum profit.[6] Some of the most notorious slave labour camps included Mauthausen, Dachau, Bergen-Belsen, Gross-Rosen (with 100 subcamps),[7] Ravensbrück (70 subcamps),[8] and Auschwitz (with 44 subcamps eventually),[9] among other places.[9][10]