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 …

The meaning of SUBMARINE is underwater; especially : undersea. How to use submarine in a sentence.

In 1920 the U.S. Navy Department established a standard Type and Class letter designation system. "SS" was established as the two-letter class designation for Submarine (first line). In addition to a …

Beyond their use in warfare, submarines continue to have recreational and scientific uses. They are heavily employed in the exploration of the sea bed, and the deepest places of the ocean floor.

1 day ago · The Ukrainian military says it has blown up a $400m Russian submarine in an unprecedented attack on the Russian navy’s most important remaining Black Sea base located in …

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...

Dec 9, 2025 · With fifth-generation submarines on the horizon, their technology has come a long way. Ultra-advanced subs of today use nuclear power and beyond.

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 …

There are two main kinds of subs. Attack submarines are small and fast. They attack other subs and surface ships with torpedos. Missile subs are larger and slower. They are built to shoot missiles at far …