planning that went into the prison escape in upstate new york was far more elaborate, unfolding over months under the eyes of prison guards who were asleep on the job. and we re not speaking figuratively they wear sleep. david sweat is spilling all kind of details to investigators how he and richard matt managed to bust out of the correctional facility. matt was killed on the run after he and sweat parted ways. mr. sweat is being held in solitary confinement at a different maximum security prison. randi kaye joins me with the latest. we knew they had done practice runs and escape route the night before they escaped. now you are learning more about his adventures in the prison tunnels. seems like they were extensive. absolutely anderson. really fascinating stuff. the new york times is reporting david sweat wandered around the tunnels beneath the prison night after night for months on end actually beginning this past winter. the paper says sweat told investigators that he would leave