 "Ghost" uses a dual-pontoon supercavitating hull, known as the small waterplane-area twin-hull (SWATH), to run at top speed through seas.It is gyro-stabilized, control is provided by 22 underwater control surfaces.Below eight knots, "Ghost" sits in the water on its centerline -long module; faster than this, the marine aluminum buoyant hulls lifts the main hull out of the water by two -long struts, achieving full stability and reducing the amount of area resisting the water.