The submerged surface area of a hull.
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HUMMOCK
1. A hillock of broken ice which has been forced upwards by pressure. It may be fresh or weathered. The submerged volume of broken ice under the hummocks, forced downwards by pressure, is calle
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SEMISUBMERSIBLE
A deck supported by pillars, fastened to pontoons. The pontoons are half submerged during operations. Kept in position by anchors (or by dynamic positioning). May equipped with its own propulsion machinery.
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ANCHOR ICE
Submerged ice attached or anchored to the bottom, irrespective of the nature of its formation
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DEEP WATER ROUTE
A route for deep draft vessels within defined limits which has been accurately surveyed for clearance of sea bottom and submerged obstacles as indicated on the chart.
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DRAFT GAUGE
A hydrostatic instrument installed in the side of a vessel, below the light load line, to indicate the depth to which a vessel is submerged
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SUBMERGED
1. Under water. 2. Having descended below the surface.
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DRY DOCK
An enclosed basin used to place a ship on dry land so that all the submerged parts and fittings can be repaired.
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FLOATING DOCK
A form of dry dock consisting of a floating structure of one or more sections, which can be partly submerged by controlled flooding to receive a vessel, then raised by pumping out the water so that the vessel's bottom can be exposed.
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FRINGING REEF
A reef attached directly to the shore of an island or continental landmass. Its outer margin is submerged and often consists of algal limestone, coral rock, and living coral. See also BARRIER REEF.
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MOBILE OFFSHORE DRILLING UNIT
A movable drilling platform used in offshore oil exploration and production. It is kept stationary by vertically movable legs or by mooring with several anchors. After drilling for oil it may be replaced by a production platform or a submerged structure.
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