The SKUA's rotationally moulded polyethylene skin, with internal tubular aluminium skeletal frame, makes it an outstandingly robust and rigid craft. With the end of the cold war the military scenario has changed and the SKUA has been updated to meet its new role. The basic boat is essentially unchanged: however, the steering has been improved to give quicker response and the engine size increased to 11.2kw (15hp) for better performance in fast flowing currents. The standard production Mariner 15hp has been modified to include PIRS (post immersion restart system), external controls with quickly detached control lines, a modified carrying handle as part of the highly responsive, rapidly detached steering system, a socket to take the HIPS stabilised power supply (to operate navigation equipment, etc) and a propeller guard. This guard takes only 2 knots off the potential top speed of 31km/h (16.5 knots) but ensures safe and reliable operation in shallow waters.