semisubmersible

Noun

 * 1) A specialised marine vessel with good stability and seakeeping characteristics, often used in offshore roles such as oil drilling.
 * 2) A tourist vessel that rides low in the water, with the majority of the vehicle submerged, with underwater windows.
 * 3) A low-freeboard vessel, capable of being incidentally submerged, with the majority of the hull located underwater.
 * 1) A low-freeboard vessel, capable of being incidentally submerged, with the majority of the hull located underwater.