November 6, 2019 DSME completes mid-life upgrades on three Chang Bogo-class submarines Written by Baird Maritime on November 6, 2019. Posted in Submersibles (Naval). Daewoo Shipbuilding and Marine Engineering (DSME) has completed an extensive mid-life upgrade (MLU) on ROKS Lee Eok Gi, a Chang Bogo-class diesel-electric attack .. Read More