maximum security penitentiary. >> we are the end of the road for the state of alaska, department of corrections. the worst behaved prisoners end up here. >> those that pose the greatest threat to other inmates and staff are segregated in house one, the lockdown unit. >> basically, minimum rights. though are in their cells for 23 hours a day. >> on the day we wanted to interview them, house one inmate antonio robertson, was in an especially foul mood. >> [ bleep ], [ bleep ] >> hey, calm down. calm down. >> every one of you [ bleep ] -- i want to start with i want to tell her, dude, you got -- >> tell her we need more food. >> what do you want to know? >> roberson, serving a 60 year sentence for murder, had spent most of the last two years in house one. >> why are you in there? >> in house one? it's a long story. i been being assaulted and so i assault people back. okay? i'm about taking care of my stuff.