The guided-missile frigate Xiaogan (Hull 615) attached to a frigate flotilla with the navy under the PLA Eastern Theater Command fires its rocket-propelled depth charges at mock hostile submarine during a maritime live-fire training exercise on April 19, 2022. Photo:China Military

Two vessels attached to a frigate flotilla with the navy under the PLA Eastern Theater Command steam in a prearranged formation during a maritime live-fire training exercise on April 19, 2022. Photo:China Military

The guided-missile frigate Xiaogan (Hull 615) attached to a frigate flotilla with the navy under the PLA Eastern Theater Command fires its main gun at mock sea targets during a maritime live-fire training exercise on April 19, 2022. Photo:China Military

The guided-missile frigate Xiaogan (Hull 615) attached to a frigate flotilla with the navy under the PLA Eastern Theater Command steams in speed during a maritime live-fire training exercise on April 19, 2022. Photo:China Military