naomi griff started the tour with a bunker that predates the prison. >> this was to store ammunition between the batteries. >> it's a perfect place for a picnic isn't it? >> yes, lovely. >> these walls must be, how thick could these be? >> these are 3 feet deep and 8 feet deep. >> and they are all brick? >> uh-huh. >> reporter: where are you taking me. >> we're going to the north capinier. >> this is slimy in here. >> well, bunker oil was stored down here. >> reporter: beneath one of the cell blocks, naomi led me to underground cells, the bars were removed years ago. >> this was what a solitary cell, they people put down here. there's no lighting or anything, totally in the dark. >> that's correct. >> oh, brother. that's solitary all right. >> it is. >> wow. >> reporter: through a maze of underground channels, naomi and i looked for a famous hole prisoners used. that's the famous hole. >> that's the famous hole. >> if anyone ever found this they could have shimmied out through there. >> and escaped. >> it would have been a dangerous escape. >> it would have been. >> thank you. >> rep