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.
More example sentences
- 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.