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.
- ‘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 proposal to build big semi-submersible ships that would act as massive floating hatcheries and be used to restock the oceans with fish has been presented to the Spanish Government.’
- ‘They are working on the first semi-submersible oil platform to be completely built in Brazil.’
- ‘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.’
- ‘It had special communications and surveillance gear, however, as well as secret double doors in the stern that allowed a fast, semi-submersible boat to launch and recover.’
A semisubmersible oil rig.
We take a look at several popular, though confusing, punctuation marks.