i'm brianna keilar. authorities have learned plenty from david sweat. sweat says he was the mastermind and his plots to escape started all the way back in january. sweat says they only used hacksaws, no power tool, carving their way through a steam pipe inside the prison. we're also learning about new details about the hours before richard matt was killed. matt was drinking grape flavored liquor in a cabin. then he went insad a trailer and fired several shots which hit annive are driving by and his dna was found on m&m wrappers not far from what he died.