concentration camps. but in 1940 hitler opens auschwitz, the first and most lethal of what will be 8 nazi death factories. camps engineered for the systematic mass murder of jews. by the end of the war more than 1 million jews will perish in auschwitz alone. >> news, letters and cables of exactly what the nazi regime was doing went to and from the vatican daily by the hundreds. >> many of his own reliable sources were telling him that the nazis are engaged in a particularly cruel and unique campaign against jews. he receives one memo from a military chaplain that begins simply, the jews. a dreadful situation which dates to 1942. >> the vatican knew precisely what was going on. there was no better informed