This report is part of a comprehensive long-term project undertaken by HRNK to use satellite imagery and former prisoner interviews to shed light on human suffering in North Korea by monitoring activity at civil and political prison facilities throughout the nation. This study details activity observed during 1968–1977 and 2002–2021 at a prison facility commonly identified by former prisoners and researchers as “Kyo-hwa-so No. 3, T’osŏng-ni” and endeavors to establish a preliminary baseline report of the facility.