california state prison, corcoran, home to hundreds of the state's most violent and infamous offenders. host of "lockup" crews in both 2000 and 2005. >> right before i walked in, i had to sign a document that kind of really made me think twice. and it basically said that in an event that there is a hostage situation inside the prison walls, they will not negotiate for your life and you know the risk that you are taking when you walk in. while at corcoran, you constantly hear these alarms going off. you're never sure what's going to happen in this place. but then when you hear those alarms and everyone dropping down to the ground and you get those rifles peering out of the towers, i mean, immediately it takes your breath away for a second. >> in most cases the alarm