LimboBuilt in greater numbers than any other class of post-war Royal Navy surface ship, the Leander class frigates outstanding design offered significant scope for useful modernisation, including the addition of the LIMBO anti-submarine weapons system. Out of the water undergoing refit at Devonport Dockyard in the mid-1980s F39 HMS Naiad is herself in limbo, mid-transformation, her LIMBO system now fitted forward of the bridge. She was sunk during a weapons testing trial on 28th September 1990 off Portsmouth having steamed 337,407 miles.