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Wave generated by mast, showing breaking and plume.
  
From:
Application: Submarine Periscope Plume Modeling
Posted Fri July 11, 2003 @11:25AM
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Application By Paul Steer
Hydrodynamics Technology, QinetiQ, UK

A submarine is the ultimate "stealth ship". Its greatest asset is the element of surprise - the ability to remain hidden under the sea. But the security blanket of millions of tons of ocean works both ways, because it also restricts the ability of the submarine's crew to see out. Hence the need for a periscope, or "visual system mast", to see above the water while remaining submerged. In fact, modern submarines have a suite of masts that raise a variety of devices above the water surface.

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