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{{subpages}} {{TOC|right}} In modern context, a '''submarine''' is a warship that routinely moves, detects targets, and attack them while under the surface water. Submarines are the original "stealth" weapons of war; their greatest strength is the challenge, to [[anti-submarine warfare]] forces, to find the submarine and localize it sufficiently to aim weapons at it. Of course, once a submarine attacks, any surviving enemies now know it is in the general area; submariners call this a "flaming datum" (referring to the target), and "clear datum" as quickly as consistent with not being detected. "We hide with pride", and the "silent service", are informal and formal mottoes of undersea warfare. The submerged time of a submarine first depends on its propulsion system. A nuclear-powered submarine is limited by the endurance of its crew, and often by the amount of food it can store. Air-independent propulsion submarines are limited by the amount of fuel and oxidizer, or monopropellant, they carry to run their engines and generators. '''Diesel-electric''' submarines are limited by the capacity of their batteries to hold an adequate electrical charge for operations. To some extent, modern diesel-electric submarines, and the versions of the First and Second World Wars, are more '''submersibles''' than submarines. They have to do a significant amount of cruising on the surface, while charging their batteries. While long-endurance nuclear submarines can be an optimal shape to travel underwater, which is poor for surface operations, battery-operated boats<ref>Traditionally, submarines are called "boats", even though some missile-launching submarines displace as much as a World War I battleship.</ref> have tocompromise their design to let them function on and below the surface. {{quotation|There are two kinds of vessels: submarines and targets|a motto of submariners worldwide}}

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