Since the emergence of offshore oil drilling platforms, submarines and other super large goods one after another, semi-submersible ships have gradually found their own place to use. Semi-submersible ships can not only use the unique way of sinking and floating, but also use ro-ro, sliding, hoisting and other methods with the help of wharf facilities, which has strong flexibility and convenience. In addition, most semi-submersible ships have self-navigation ability, and the speed can reach more than 15 knots. It can greatly shorten the transportation cycle of important equipment. At the same time, due to less carrying equipment and less fuel consumption, the endurance capacity of semi-submersible ship can reach tens of thousands of kilometers. More importantly, semi-submersible ship navigates in the water through semi-submersible mode, with deep draft and deck often consistent with the water surface
it has high stability against strong winds and waves.
The semi-submersible ship appeared only after the appearance of super large cargo.