A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.)

Nov 21, 2025 · What is a submarine? A submarine is a naval vessel capable of propelling itself both beneath the water and on the water’s surface, a unique capability among warships.

Apr 16, 2025 · The US Navy’s largest-ever nuclear submarine, the USS District of Columbia (SSBN-826), moves closer to launch with final propulsor delivery.

Apr 24, 2025 · Today’s submarine force is the most capable force in the world and the history of the U.S. Navy. The composition of the current force consists of Los Angeles, Ohio, Seawolf, and Virginia -class...

Jul 22, 2025 · A submarine is a specialized watercraft designed for underwater operations. Unlike surface ships, submarines can submerge and navigate beneath the water’s surface, making them …

3 days ago · A group representing the U.S. Navy’s “Silent Service” is pressing for new research on environmental hazards in submarines.

Comprehensive coverage of submarine technologies, submarines design, and operational use in military and scientific contexts.

The introduction of the diesel engine, then the nuclear submarine, saw great expansion in submarine use — and specifically military use — during World War I, World War II, and the Cold War.

The greatest advance in submarine technology occurred on Jan. 21, 1954, with the launch of the USS Nautilus, the first nuclear-powered vessel. Nuclear power enabled submersible vessels to become …

3 days ago · The first widely circulated image of the bizarre-looking trimaran point to it being just as much submarine as surface vessel. The purpose of this intriguing craft is still unknown, but it points …