The prisoners were mobilized for road building in Kabato and Abashiri, and for the labor in coal or sulfur mines (in Mt. Atosanupuri and so on) in Sorachi and Kushiro.
樺戸や網走では道路建設が、空知や釧路では炭鉱、硫黄鉱山（アトサヌプリなど）の労働などに動員された。