Jackup rig

A jackup rig or a self-elevating unit is a type of mobile platform that consists of a buoyant hull fitted with a number of movable legs, capable of raising its hull over the surface of the sea. The buoyant hull enables transportation of the unit and all attached machinery to a desired location. Once on location the hull is raised to the required elevation above the sea surface supported by the sea bed.

The legs of such units may be designed to penetrate the sea bed, may be fitted with enlarged sections or footings, or may be attached to a bottom mat.
Generally jackup rigs are not self-propelled and rely on tugs or heavy lift ships for transportation.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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