The 377-foot vessel can dive to depths of more than 800 feet below the surface and maneuver at speeds of over 25 knots.

The submarine must be at periscope depth to deploy an antenna that can breach the water's surface or use communication buoys or a buoyant antenna to send and receive information via satellite ...

A submarine attached to a submarine flotilla with the navy under the Chinese PLA Northern Theater Command steams towards the designated area during a recent maritime training exercise.

The world's oceans are changing, with rising temperatures and different salinity levels. Submarine warfare could be directly affected, and it could be harder to detect the vessels in some areas.