A submarine attached to a flotilla with the navy under the Chinese PLA Northern Theater Command steams on the sea during a maritime training exercise on January 4, 2026. (eng.chinamil.com.cn/Photo by Zhang Nan)1月4日，北部战区海军某潜艇支队组织出海训练。图为潜艇在水面航行。（英文中国军网/张楠 摄）