and we have to start with some new concerns about security at that new york prison where two murderers escaped. >> surviving escapee david sweat told police authorities that the men had been working for six months on the escape. they even had a test run on the night before they left for good. but prison officials now facing punishment. abc's linzie janis reports. >> reporter: a major shake-up behind the walls of this prison. the superintendent, his security chief and ten guards and officials now on all indefinite leave as investigators learn the two killers started digging through the walls of their cells way back in january. >> does this mean their cells weren't checked in six months? >> i think that's an issue. >> reporter: prosecutor andrew wylie telling me david sweat admits the two men broke out of their cells night after night to scout the inside of the prison walls. he and matt even doing a dry run before the big escape, and after they broke free, they knew all too well they were among