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.

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 ...

Photos of North Korea's military provide a glimpse into what it's like to serve in one of the world's largest and most ...