inmates in zomba are fed just one meal a day, a small bowl of gruel made out of corn flour.'s no food at all. chikondi salanje sang the album nominated for a grammy. he was doing time for burglary. do you eat meat? chicken, beef? >> ( laughs ) >> cooper: you're laughing. that's not good. when was the last time you had meat? >> chikondi salanje: 2014. 25 december. >> cooper: two and a half years ago? on christmas day? >> salanje: yeah. >> cooper: it's not just the lack of food. zomba is so overcrowded, prisoners say they only have enough room in their cells to sleep wedged against one another lying on their sides. stefano nyirenda also sang on the album. so you're sleeping on your side? >> stefano nyirenda ( translated ): when you want to turn, you have to do it together. >> cooper: right next to each other? how do you sleep? >> nyirenda ( translated ): we just sleep. we have no choice. >> cooper: stefano is in for robbery, and he is h.i.v.- positive, as are around a quarter of zomba's inmates. they occasionally get visits from an italian nun, sister anna tommasi, who runs a