 In addition to fuel, the ship carries ammunition and other stores which can be transferred while underway.She can operate a Merlin HM1 helicopter, or other helicopters of similar size, from a hangar and flight deck at the stern.In October 2004, "Wave Knight" and the frigate HMS "Montrose" provided assistance to the stricken Canadian submarine HMCS "Chicoutimi", which ran into difficulties 100 miles (160 km) north-west of County Mayo, Ireland after 2,000 litres of seawater entered the vessel due to hatches being left open in the fin.