Each had at least one factory or quarry nearby where the inmates were forced to work.[202] Himmler took a particular interest in providing laborers for IG Farben, which was constructing a synthetic rubber factory at Auschwitz III–Monowitz.[203] The plant was almost ready to commence production when it was overrun by Soviet troops in 1945.[204] The life expectancy of inmates at Monowitz averaged about three months.[205] This was typical of the camps, as inmates were underfed and lived under disastrously bad living conditions.