They were first widely used during World War I (1914–1918), and are now used in many navies, large and small. Īlthough experimental submarines had been built earlier, submarine design took off during the 19th century, and they were adopted by several navies. Submarines are referred to as boats rather than ships irrespective of their size. The term 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. It differs from a submersible, which has more limited underwater capability.
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