msnbc takes you behind the walls of america's most notorious prisons into a world of chaos and danger. now, the scenes you've never seen. "lockup raw." in prison it's said you can do the time or let the time do you. >> i went ballistic, insane. >> we've got guys here 17, 18, their puberty is just now coming. they have a lost tension, they have a lot of energy and they've been locked up since they were 15. that's frustrating these dudes. >> on a good day, too much idle time can invite mischief. >> there is a lot of sex in prison. >> they masturbate, curse you out, call you names. >> idle hands is the devil's playground. >> on a bad day too much time can lead to demand. >> i'm making a weapon right now.