the main part on my chest, it's the blast and that's for dongo blast.robably one of the biggest prison gangs in texas. i chose to put it in big letters on my chest because when i get to a prison unit or a pod or something the first thing i do is i take off my shirt, and it's clearly visible. if someone has a problem with me, they're going -- they're going to let it be known. >> diaz is also a tattoo artist and says he has applied many of his tattoos himself. most are gang related but one is a fan tribute. >> which is my taylor swift. she's -- i did her for my own personal gratification. i don't know what it is about her but the first time i heard her voice, i was locked up. i would listen to her music and she's got like this really, cute, country voice. it soothed me. no matter what's going on, there might be fights, chaos, the building could be burning down but if i'm listening to taylor swift, i'm relaxed. >> but it seems no melody can quiet the outbursts that punctuate life in the administrative segregation wing which houses members of the jail's lar