The island lies in Oslofjord, Norway. 115 men are imprisoned there: bank robbers, drug dealers, sex criminals, Hell’s Angels, frauds, gang leaders and murderers. Mostly serving long terms. On the island there are no cells, no cameras, no fences. The guards don’t carry weapons while the prisoners work with chainsaws and kitchen knives. It’s only a two-hour swim to the mainland and yet no one goes for it.