it took shahib to realize there's more value in society and life than committing crime. >> with the knowledgen quentin, the squires hope to never see these boys restrained by a security level. >> it's like i don't want to come over here. not a good place to be. overall, today was really, really good. i felt like i made a difference today. >>> america's prisons, dangerous, often deadly. there are 2 million people doing time. every day is a battle to survive and to maintain order. >> down on your feet, now! >> among the nation's most notorious institutions, san quentin state prison. our cameras spent months documenting life on the inside, where gangs, drugs and sheer boredom make up a violent mix. this is "lockup san quentin: