A submarine attached to a naval submarine flotilla under the Chinese PLA Northern Theater Command sails in a surface position during a combat training exercise on January 6, 2025. (eng.chinamil.com.cn/Photo by Zhang Nan)

A submarine attached to a naval submarine flotilla under the Chinese PLA Northern Theater Command sails in a surface position during a combat training exercise on January 6, 2025. (eng.chinamil.com.cn/Photo by Zhang Nan)

A submarine attached to a naval submarine flotilla under the Chinese PLA Northern Theater Command sails in a surface position during a combat training exercise on January 6, 2025. (eng.chinamil.com.cn/Photo by Zhang Nan)

A submarine attached to a naval submarine flotilla under the Chinese PLA Northern Theater Command sails in a surface position during a combat training exercise on January 6, 2025. (eng.chinamil.com.cn/Photo by Zhang Nan)