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Wikipedia definition
1. Semi-submersibleA semi-submersible is a specialised marine vessel with good stability and seakeeping characteristics. The semi-submersible vessel design is commonly used in a number of specific offshore roles such as for offshore drilling rigs, safety vessels, oil production platforms and heavy lift cranes. The terms semisubmersible, semi-sub or just semi are also generally used for this vessel design.
Read “Semi-submersible” on English Wikipedia
Read “半潜水艇” on Japanese Wikipedia
Read “Semi-submersible” on DBpedia

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