submersible

n. submarine; small craft designed for underwater exploration

adj. submergible, capable of being submersed

A submersible is a type of underwater vessel with limited mobility which is typically transported to its area of operation by a surface vessel or large submarine. Apart from size, the technical difference between a 'submersible' and a 'submarine' is that submersibles are not totally autonomous. They may rely on a support facility or vessel for charging of batteries, high pressure air, high pressure oxygen replenishment, or all of these.
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Noun
1. an apparatus intended for use under water
(hypernym) apparatus, setup
(hyponym) bathyscaphe, bathyscaph, bathyscape
2. a warship designed to operate under water
(synonym) submersible warship
(antonym) surface ship
(hypernym) warship, war vessel, combat ship
(hyponym) submarine, pigboat, sub, U-boat
Adjective
1. capable of being immersed in water or functioning while submerged; "a submersible pump"; "a submergible electric frying pan"
(synonym) submergible
(antonym) nonsubmersible, nonsubmergible

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A mobile Submersible Drilling Structure used in arctic areas. The rig is moved onto the drilling site and submerged during periods when the water is free of ice. All equipment below the waterline is surrounded by a caisson to protect it from damage by moving ice. The Drilling Deck has no square corners so that moving ice can better flow around it
  

A mobile submersible drilling structure constructed of several steel cylinders, or bottles. When the bottles are flooded, the rig submerges and rests on bottom; when water is removed from the bottles, the rig floats. The latest designs of this type of rig drill in water depths up to 100 feet, or 30.5 meters
  

An offshore drilling structure that has several compartments that are flooded to cause the structure to submerge and rest on the ocean floor. Of necessity, most submersible rigs are used only in shallow waters
  

An Offshore Drilling Structure that has several compartments which are flooded to cause the structure to submerge and rest on the ocean floor. Of necessity, most submersible rigs are used only in shallow waters
  

submersible /səb'mə:səbl/
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