. >> nicholas corbin was sentenced to one year in idu, the maximum amount of time. a fight went down in my cell house and i was accused of being involved with it. the individual needed to be taken to an outside hospital and because of that, i was sent up here. i'm not disappointed in anything i've done. i've made the decisions that i've made, you know, we're caged like animals for 23 hours a day. we're given food that's of poor quality. there isn't enough of it to keep us full in between meals. and that's just how we live our lives. >>> up next -- >> my life almost ended right upstairs. it was just that easy. within seconds your whole life can change. >> an officer returns to the scene of a brutal attack that almost killed her. >>> and later, we'll take you inside isp's death row. >> this is the holding area of the condemned offender. >>> 65% of the people employed by the indiana state prison are custody officers who work directly with offenders. most armed only with handcuffs, a can of mace and a remote radio. >> what's the biggest challenge inside the walls? >> ma