Emergency Main Ballast Tank Blow
An emergency main ballast tank blow is a procedure used aboard a submarine that forces high-pressure air into its main ballast tanks A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list .... The high-pressure air forces ballast water from the tanks, quickly lightening the ship so it can rapidly rise to the surface. The partial failure of the emergency main ballast tank blow system, caused by icing of strainers in the air lines due to "the high volume of air moving past the strainers at such high velocity hichwould have caused them to cool rapidly" contributed to the loss of in 1963. That accident resulted in substantial redesign of submarine emergency blow systems by the United States Navy: "Part of this initiative was to end the practice of brazing smaller pipes, and to instead start ...
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980604-N-7726D-002 Submarine Emergency Surfacing Drill
98 may refer to: * 98 (number) * Windows 98, a Microsoft operating system Years * 98 BC * AD 98 * 1798 * 1898 * 1998 * 2098 See also * Californium (atomic number), a chemical element * 98 Degrees (98°), a band * ''Madden NFL 98 ''Madden NFL 98'' is a 1997 football video game. It features John Madden on the cover. It was the last version of the ''Madden'' series to be released for the Super NES, Genesis and Sega Saturn platforms, as well as the last Madden game to uti ...

Submarine
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely operated vehicles and Autonomous underwater vehicle, robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as ''boats'' rather than ''ships'' irrespective of their size. Although experimental submarines had been built earlier, submarine design took off during the 19th century, and they were adopted by several navies. They were first widely used during World War I (1914–1918), and are now used in many navy, navies, large and small. Military uses include attacking enemy surface ships (merchant and military) or other submarines, and for aircraft carrier protection, Blockade runner, blockade running, Ballistic missile submarine, nuclear deterrence, reconnaissance, conventio ...
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Ballast Tank
A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural hogging or sagging stresses, or to increase draft, as in a semi-submersible vessel or platform, or a SWATH, to improve seakeeping. Using water in a tank provides easier weight adjustment than the stone or iron ballast used in older vessels, and makes it easy for the crew to reduce a vessel's draft when it enters shallower water, by temporarily pumping out ballast. Airships use ballast tanks mainly to control buoyancy and correct trim. History The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or argonaut octopus. The concept has been invented and reinvented many times by humans to serve a variety of purpo ...
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