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SUBMARINE SUPER 99 #01 - SUBMA

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Both the US and British navies operate nuclear-powered submarines that deploy for periods of six months or longer. Other navies that permit women to serve on submarines operate conventionally powered submarines, which deploy for much shorter periods—usually only for a few months. [111] Prior to the change by the US, no nation using nuclear submarines permitted women to serve on board. [112] With Taiwan holding elections next year, some western countries fear that could provide the impetus for an attempt by China to seize control of the island. These exercises helped HMS Audacious to demonstrate her prowess as the newest, most capable SSN that the UK has to offer while also strengthening NATO capability and interoperability and demonstrating our resolve towards NATO Missions,” said Commanding Officer, Commander Jim Howard.

Suleman Dawood, the Pakistani 19-year-old aboard the vessel, was a student at the University of Strathclyde in Glasgow, Scotland, the university confirmed Thursday. He just completed his first year in the business school there. In 2020, Japan's national naval submarine academy accepted its first female candidate. [116] Abandoning the vessel Submarine Escape Immersion Equipment suit Mk 10 A submarine escape suit with rebreather The reason why diesel–electric transmission has become the dominant alternative in spite of these disadvantages is of course that it also comes with many advantages and that, on balance, these have eventually been found to be more important. The advantages include the following: [81] [82]One of the first submarines with diesel–electric transmission, HMS Hajen, on display outside Marinmuseum in Karlskrona

It entails a loss of fuel-efficiency as well as power by converting the output of the diesel engine into electricity. While both generators and electric motors are known to be very efficient, their efficiency nevertheless falls short of 100 percent. Military submarines use several systems to communicate with distant command centers or other ships. One is VLF (very low frequency) radio, which can reach a submarine either on the surface or submerged to a fairly shallow depth, usually less than 250 feet (76m). ELF (extremely low frequency) can reach a submarine at greater depths, but has a very low bandwidth and is generally used to call a submerged sub to a shallower depth where VLF signals can reach. A submarine also has the option of floating a long, buoyant wire antenna to a shallower depth, allowing VLF transmissions by a deeply submerged boat. The United States also used hydrogen peroxide in an experimental midget submarine, X-1. It was originally powered by a hydrogen peroxide/diesel engine and battery system until an explosion of her hydrogen peroxide supply on 20 May 1957. X-1 was later converted to use diesel–electric drive. [87] Women have served on US Navy surface ships since 1993, and as of 2011–2012 [update], began serving on submarines for the first time. Until presently, the Navy allowed only three exceptions to women being on board military submarines: female civilian technicians for a few days at most, women midshipmen on an overnight during summer training for Navy ROTC and Naval Academy, and family members for one-day dependent cruises. [108] In 2009, senior officials, including then-Secretary of the Navy Ray Mabus, Joint Chief of Staff Admiral Michael Mullen, and Chief of Naval Operations Admiral Gary Roughead, began the process of finding a way to implement women on submarines. [109] The US Navy rescinded its "no women on subs" policy in 2010. [110]

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When submerged, the water pressure on a submarine's hull can reach 4 MPa (580 psi) for steel submarines and up to 10MPa (1,500psi) for titanium submarines like K-278 Komsomolets, while interior pressure remains relatively unchanged. This difference results in hull compression, which decreases displacement. Water density also marginally increases with depth, as the salinity and pressure are higher. [61] This change in density incompletely compensates for hull compression, so buoyancy decreases as depth increases. A submerged submarine is in an unstable equilibrium, having a tendency to either sink or float to the surface. Keeping a constant depth requires continual operation of either the depth control tanks or control surfaces. [62] [63]

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