Wikipedia:
jackup barge
A jackup barge is a type of barge that may stand still on the sea floor by three or four supporting columns.
The supporting columns are usually moved up and down by a hydraulic system. The whole barge can also be jacked up when the supporting columns are touching the sea floor.
The barge acts as a kind of platform. This type of barge is often used as a diving platform or for oil drilling.
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