>> but inside the walls of spring creek, natural beauty gives way to the harsh reality of a maximum security penitentiary. >> we're at the end of the road for the state of alaska department of corrections the worst behaved prisoners end up here. >> those who pose the greatest threat to other inmates and staff are segregated in house one, the lockdown unit. >> basically, minimum rights. minimum, they're in their cells for 23 hours a day. >> on the day we wanted to interview him, house one inmate, antonio robertson was in an especially foul mood. >> [ bleep ], [ bleep ]. [ bleep ]. >> calm down. >> every one of you [ bleep ], [ bleep ], i'm going to start with, you guyed are [ bleep ]. we need more. what do you want to know? >> robertson, serving a 60-year sentence for murder has spent