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 · A submarine is any naval vessel that is capable of propelling itself beneath the water as well as on the water’s surface. This is a unique capability among warships, and submarines are quite …

5 hours ago · Ukraine’s domestic security service, the SBU, said Monday that it struck a Russian submarine in the Black Sea port of Novorossiysk, causing critical damage to the vessel and …

6 days ago · With fifth-generation submarines on the horizon, their technology has come a long way. Ultra-advanced subs of today use nuclear power and beyond.

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 …

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.

Jul 2, 2025 · Explore the United States' Submarine Force, featuring attack, ballistic missile, and guided missile submarines and their diverse missions.

4 hours ago · Kyiv says Kilo-class submarine is knocked out of operation in the first such attack using Sea Baby drones.

“Submarine” as a noun—meaning a submersible craft—originated as short for "submarine boat" and older books such as Jules Verne ’s Twenty Thousand Leagues Under the Sea always use this term.