Submarine

A submarine (often shortened to sub) is a watercraft capable of independent operation underwater.

They were first used widely during World War I (1914-1918), and are now used in many navies, large and small

The Imperial Japanese Navy operated the most varied fleet of submarines of any navy, including Kaiten crewed torpedoes, midget submarines (Type A Ko-hyoteki and Kairyu classes), medium-range submarines, purpose-built supply submarines and long-range fleet submarines.

Lewis Nixon's Crescent Shipyard in Elizabeth, New Jersey, Holland VI was purchased by the United States Navy on 11 April 1900, becoming the Navy's first commissioned submarine, christened USS Holland.

The Royal Navy commissioned five Holland-class submarines from Vickers, Barrow-in-Furness, under licence from the Holland Torpedo Boat Company from 1901 to 1903.

These types of submarines were first used during the Russo-Japanese War of 1904-05.

They were first used widely during World War I (1914-1918), and are now used in many navies, large and small.

During World War II, 314 submarines served in the US Navy, of which nearly 260 were deployed to the Pacific.

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.) The term "submarine" is also sometimes used historically or informally to refer to remotely operated vehicles and robots, or to medium-sized or smaller vessels (such as the midget submarine and the wet sub).