What is a Submarine?

What is a Submarine?
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What is a Submarine?, Watercraft, Water Submarine, Vehicles and Robots. A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability.

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.

Most large submarines consist of a cylindrical body with hemispherical (and/or conical) ends and a vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes
Submarines have one of the widest ranges of types and capabilities of any vessel. They range from small autonomous examples and one or two-person vessels that operate for a few hours, to vessels that can remain submerged for six months—such as the Russian Typhoon class, the biggest submarines ever built. Submarines can work at greater depths than are survivable or practical for human divers. Modern deep-diving submarines derive from the bathyscaphe, which in turn evolved from the diving bell.
In an emergency, submarines can transmit a signal to other ships. The crew can use Submarine Escape Immersion Equipment to abandon the submarine. The crew can prevent a lung injury from the pressure change known as pulmonary barotrauma by exhaling during the ascent. Following escape from a pressurized submarine, the crew is at risk of developing decompression sickness. An alternative escape means is via a Deep Submergence Rescue Vehicle that can dock onto the disabled submarine.
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