Frighteningly black and sleek, the 76-foot-long, 40-ton submarine known only by its assigned battle number, HA-19, served as part of the Japanese fleet’s vanguard, arriving at Hawaii even before ...

An underwater fiber optic cable between the western coast of Latvia and the Swedish island of Gotland was damaged ... conducting regular patrols and joint exercises. Warships, submarines, and planes, ...

The Navy wants the vessel to be powered by a nuclear reactor plant using low-enriched uranium (LEU), rather than the highly enriched uranium (HEU).