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report on submarine technology pdf download
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Can i get a pdf report of submarine technology seminar topic.
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A submarine is a vessel capable of operating independently underwater. It differs from a submersible, which has a more limited underwater capacity. The term most commonly refers to a large crewed vessel. It is also sometimes used historically or colloquially to refer to vehicles and remote-controlled robots, as well as medium or smaller vessels, such as the submarine eel and the wet submarine. Used as an adjective in phrases like submarine cable, submarine means "under the sea". The submarine noun evolved as a shortened form of undersea boat (and is often shorter to sub). For reasons of naval tradition, submarines are often referred to as "boats" rather than "boats", regardless of their size.

Although experimental submarines had been built before, submarine design took off during the 19th century, and were adopted by several marines. The submarines were first widely used during World War I (1914-1918), and now appear in many large and small marinas. Military use includes attacking enemy surface vessels (merchant and military), attacking other submarines, aircraft carrier protection, execution blocking, ballistic missile submarines as part of a nuclear attack force, conventional ground reconnaissance (eg with A cruise missile) Undercover insertion of special forces. Civil uses for submarines include marine science, salvage, exploration, and facility inspection and maintenance. Submarines can also be modified to perform more specialized functions, such as search and rescue missions or submarine cable repair. Submarines are also used in tourism, and for underwater archaeology.

Most large submarines consist of a cylindrical body with hemispherical (or conical) ends and a vertical structure, generally located in the middle of the ship, containing communications and detection devices as well as periscopes. In modern submarines, this structure is the "sail" in American usage, and "end" in European usage. A "maneuvering tower" was a feature of earlier designs: a pressure hull separated above the main body of the boat allowing the use of shorter periscopes. There is a propeller (or pump jet) in the rear, and several hydrodynamic control fins. Submarines smaller, deep scuba diving and special divers can deviate significantly from this traditional design. The submarines use dive airplanes and also change the amount of water and air in the ballast tanks to change the buoyancy to submerge and emerge.

The submarines have one of the widest ranges of types and capacities of any ship. They range from small, autonomous examples and boats of one or two people operating for a few hours to ships that can remain submerged for six months, such as the Russian Typhoon class, the largest submarines ever built. Submarines can work at depths greater than those that can survive or practice for human divers. The modern submarines of submarines derive of bathyscaphe, that in turn evolved of the bell of diving.

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