China is building new submarines that will put more of the U.S. mainland within range—and do so from waters closer to its own coastline. Beijing’s undersea advances, including the expected deployment ...

The British Ministry of Defense revealed Russian submarines recently conducted "nefarious activity" around underwater cables ...

China is building nuclear-powered submarines faster than the United States, and the gap is widening. A new warning from the Center for Strategic and International Studies highlights how Beijing’s ...

Submarines are among the most advanced and mysterious machines ever built. Designed to operate beneath the surface of the sea ...