This long building was called Barracks X.  It was built in 1942 by Polish priests and  is both the gas chamber (left end) and the crematorium (right end).

     One of 6 incinerators.  Each was capable of holding 7 or 8 starved victims and the burn time is calculated to be as short as 10-15 minutes per load once the correct temperature of 1400 f. was reached and maintained.