Kang Chol-hwan is a former prisoner of Yodok Political Prison Camp and has written a book, The Aquariums of Pyongyang, about his time in the camp. The International Coalition to Stop Crimes Against Humanity in North Korea (ICNK) estimates that over 10,000 people die in North Korean prison camps every year. Re-education camps The re-education camps for criminals are run by the interior ministry. There is a fluent passage between common crimes and political crimes, because people who get on the bad side of influential partisans are often denounced on the basis of false accusations. They are then sent to detention centers, threatened with brutal torture and forced to make false confessions (Lee Soon-ok, for example, had to kneel down whilst being showered with water at icy temperatures with other prisoners, of whom six did not survive) and are then condemned in a brief show trial to a long-term prison sentence. In North Korea, political crimes are greatly varied, from border crossing to any disturbance of the political order, and they are rigorously punished. Due to the dire prison conditions with hunger and torture, a large percentage of prisoners do not survive their sentence term. The re-education camps are large prison building complexes surrounded by high walls. The plight of the prisoners is quite similar to that in the political prison camps. They have to perform slave labor in prison factories. If they do not meet the work quota, they are tortured and (at least in Kaechon camp) confined for many days to special prison cells, too small to stand up or lie full-length in. In distinction from the internment camps for political prisoners, the re-education camp prisoners are instructed ideologically after work and are forced to memorize speeches of Kim Il-sung and Kim Jong-il and to undergo self-criticism rites. Many prison inmates are guilty of common crimes penalized also in other countries, but often they were committed out of economic necessity, e.g. illegal border crossing, stealing food or illegal trading. There are around 15–20 reeducation camps in North Korea. Two camps are documented with coordinates, satellite images and testimonies of former prisoners. Other camps are documented with short testimonies of former prisoners. Kyo-hwa-so No. 3 Sinuiju (c. 2,500 prisoners) in North Pyongan Kyo-hwa-so No. 4 Kangdong (c. 7,000 prisoners) in South Pyongan Kyo-hwa-so No. 8 Yongdam (c. 3,000 prisoners) in Kangwon Kyo-hwa-so No. 11 Chungsan (c. 3,300 prisoners) in