The U.S. Navy’s critical Columbia-class ballistic missile submarine program is facing significant delays and cost overruns.

America's dominance beneath the waves grows as its newest nuclear submarine completed its initial sea trials and prepares for ...

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

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