Submarine flotilla in combat training

A submarine attached to a naval flotilla under the PLA Northern Theater Command sails in the waters during the combat training drills on January 4, 2022. (eng.chinamil.com.cn/Photo by Wu Haodong)

A submarine attached to a naval flotilla under the PLA Northern Theater Command sails in the waters during the combat training drills on January 4, 2022. (eng.chinamil.com.cn/Photo by Wu Haodong)