A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term most commonly refers to a large, crewed, autonomous vessel. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Used as an adjective in phrases such as submarine cable, "submarine" means "under the sea". The noun submarine evolved as a shortened form of submarine boat (and is often further shortened to sub). For reasons of naval tradition, submarines are usually referred to as "boats" rather than as "ships", regardless of their size.

Although experimental submarines had been built before, submarine design took off during the 19th century, and they were adopted by several navies. Submarines were first widely used during World War I (1914–1918), and now figure in many navies large and small. Military usage includes attacking enemy surface ships (merchant and military), submarines, aircraft carrier protection, blockade running, ballistic missile submarines as part of a nuclear strike force, reconnaissance, conventional land attack (for example using a cruise missile), and covert insertion of special forces. Civilian uses for submarines include marine science, salvage, exploration and facility inspection/maintenance. Submarines can also be modified to perform more specialized functions such as search-and-rescue missions or undersea cable repair. Submarines are also used in tourism, and for undersea archaeology.

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The Marías announce ‘The Submarine Tour’ with 1 stop in Pa.: How to buy tickets

Penn Live 16 Apr 2024
The Marías have announced “The Submarine Tour” 2024 that includes one stop in Pa .......

The Marías Announce “The Submarine Tour” (Live Nation Entertainment Inc)

Public Technologies 16 Apr 2024
Today, Grammy-nominated band The Marías announce their long-awaited and highly anticipated "The Submarine Tour," produced by Live Nation, hitting major cities across North America including Los Angeles, New York, Miami, Chicago, Toronto and more ... "The Submarine Tour" Routing....