The "XXLUVs" can likely be loaded with significantly larger payloads than the U.S. Navy's Orca, which is also undergoing testing.

Pacific, said Russia could hand China submarine technology, altering the balance of power.

Russia has maintained—and increased—its submarine operations across the world’s oceans, including the northern Atlantic and ...

Nuclear-powered submarines use some of the most advanced military technology in the world. These are the ones that are a cut ...

China's surface navy is growing at a rapid pace as busy shipyards turn out new warships, but the US maintains an edge ...