Denoting an oil or gas drilling platform or barge with submerged pontoons able to be flooded with water when the vessel is anchored on site in order to provide stability.
- They are working on the first semi-submersible oil platform to be completely built in Brazil.
- Our destination was a semi-submersible oil rig, by which I mean that most of it, two enormous hollow vessels, each the size of a warship, floated beneath the surface.
- The first is a custom-built Assembly and Command Ship, and the second is the Launch Platform, a semi-submersible vessel that is one of the world's largest oceangoing launch platforms.
A semisubmersible oil rig.
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