A semi-submersible is a type of floating structure designed to remain stable on the water's surface while partially submerged. These vessels are commonly used in the offshore oil and gas industry for drilling and production activities. Their unique design, which includes large buoyant columns, helps them withstand harsh weather conditions and high waves. The stability of semi-submersibles is achieved through their deep draft and wide base, allowing them to minimize motion caused by ocean currents and wind. This makes them suitable for various applications, including offshore wind farms and marine research, in addition to their primary role in the energy sector.