From end of June 1940 until September 1942 approximately 15,000 persons were killed in the scope of the programme and the Sonderbehandlung 14f13. The staff consisted of about 100 persons. One third of them were ordered to the extermination camps in occupied Poland, because of their experiences in deception, killing, gassing and disposing of prisoners. During August / September 1942 the Sonnenstein killing centre was liquidated and incriminating installations such as gas chambers and crematorium ovens dismantled. From October 1942 the buildings were used as a military hospital.