A mobile bottom-supported offshore drilling structure with several compartments that are flooded to cause the structure to submerge and rest on the seafloor. Submersible rigs are designed for use in shallow waters to a maximum of 175 ft (53.4 m). Submersible drilling rigs include the posted barge submersible, the bottletype submersible, and the arctic submersible. See bottom-supported offshore drilling rig.
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