A submarine attached to a flotilla with the navy under the Chinese PLA Northern Theater Command steams towards the designated sea area during a maritime training exercise on March 4, 2026. (eng.chinamil.com.cn/Photo by Zhang Nan)

A submarine attached to a flotilla with the navy under the Chinese PLA Northern Theater Command steams towards the designated sea area during a maritime training exercise on March 4, 2026. (eng.chinamil.com.cn/Photo by Zhang Nan)