Researchers from Houston's Rice University have developed the smallest submarine ever invented, and it's so small, it could swim through your blood stream. The incredibly fast machine is only 244 ...

Inside the effort to deliver a ‘transformational improvement’ in how the US builds submarines, vital to preserving its undersea advantage.

Russia's investment in its nuclear submarines is causing concern among Western allies after the country's subs were deployed off the coast of the United States and close to European NATO nations.

In this July 30, 2015 photo, shipyard workers at General Dynamics Electric Boat prepare the submarine Illinois for float-off in Groton, Conn. The U.S. Navy is using a new painting process and dozens ...