"außenlager hambühren-ovelgönne" (lager iii, waldeslust) at hambühren south of winsen was in use from august 23, 1944 to february 4, 1945. it was an abandoned potash mine, now intended as an underground production site for bremen plane manufacturer focke-wulf. around 400 prisoners, mostly female polish or hungarian jews, were forced to prepare the facility and to help lay train tracks to it. this was done for the company hochtief.