 The detachment ( or "") is the basic unit of the prison.When not in the detachment, prisoners are required to participate in penal labour, which is in the form of work brigades in colony production zones where prisoners earn a wage of which most is paid to the colony for their upkeep.The detachment is largely self-organised, with the prison administration designating the "head monitor" with the job of keeping order and to liaise with the prison administration, and is supported by various prisoners' committees responsible for health and safety, cleanliness, energy saving, and also psychological counselling.