and the most hard core can be found 50 miles east of brussels in the town of hasselt. it houses 470 men and, in a separate unit, 30 women. >> this is unique. the other prisons in this country, they are old prisons. they are more than 100 years, 150 years old and have a culture. bad or good culture but they always have a culture. we started from zero. >> as the nation's newest high security prison, hasselt employs a wide array of technology to manage inmates. but many of the prison policies are nothing at all like we've ever seen in the u.s. from 9:00 at night until 6:30 in the morning, correctional officers are not allowed to go inside cells without special permission from the director. >> at 9:00 they are locked in the cells. they collect the keys and can you not go in the cells. >> why? >> that's the rules here. >> what do you think goes on behind these doors? >> i don't know and i don't want to know. but when you go out, make your checks, you can sometimes smell the weed. the only thing can you do is the day after get a complete checkup of the cell. but most of the