the road ends at brushy mountain. and there's -- there's nowhere else to go. >> when i first come up, my heart was beating hard. you could see the windows open. you could hear the people yelling and screaming in here. i'm looking at it like, "what have i got myself into now?" >> this ain't no playground. there's killers here, have been for years. always will be. >> the most violent of brushy mountain's inmates are housed in the prison's maximum security unit. >> we'll take anyone from any other facilities. there are times when another institution needs to transfer an inmate that maybe caused a problem. brushy is known as the end of the line. if you come here, you stay with us. >> inmates in the max unit are locked up 23 hours a day with just one hour of yard time. there is no physical contact with other offenders. only designated workers or rock men are allowed outside their cells at other times. >> we work seven days a week. you come out, you feed, you clean whatever needs to be cleaned. you know what i mean? i've ha

prison slang for a janitor at the maximum security unit at the brushy mountain correctional complex innnessee. >> i work in "b" pod and that's the punitive pod. so i have to deal with individuals who have been in a lot of trouble or some doing hole time. i'm going to have to deal with the ones that's off in they mind a little bit. so some days they may feel like, when i let their flap down that they want to throw doodle on me that day, or urine. this is what we've got to deal with. even they may feel like they may want to throw it on me that day. so, it's things you got to deal with. >> lockup crews also stay constantly aware knowing all too well they could wind up in the line of fire. >> in my mind, that is one of the worst things that could happen. we were shooting san quentin, alpine section, and we were down on the ground floor. and, suddenly i felt something hit me on the top of my head. and i had the worst thought, oh, my god i had just been gassed. luckily, it turned out to be a banana peel. >> when we visited the stateville correctional center in illinois, we encountered anothe

it's a brushy, nasty place. we have to get close to one of the most dangerous animals in the world, and it's very likely to charge us and possibly kill us, okay? i'm sure that will make half the people in the world happy, piers. maybe more of them. but the fact is, it's a dangerous situation. there's experts there that have earmarked them. and they're killing themselves already. so to that end i'm a hunter, i want to experience a black rhino. i want to be there and be a part of it, okay? i believe in the cycle of life. i don't believe that meat comes from the grocery store. i believe that animal died and i respect it. and piers, i haven't shot a black rhino yet, have i? i'm going on a black rhino hunt. i'm going on a conservation hunt for earmarked animals that are killers, killing other rhinos. >> let me address that point. because jeff flocken from the international fund for animal welfare says honestly it's a farce to say this is being done for conservation. i do agree that there is sometimes a need to manage