HMS Una was a British U-class submarine, of the second group of that class, built at Chatham Dockyard.

[1] She also damaged two sailing vessels and the Italian merchant Cosala (the former Yugoslavian Serafin Topic).

The damaged Italian ship was grounded, but declared a total loss and eventually sank during a storm.

The idea was to attack an airfield in support of Operation Pedestal, but after blowing up the electrical power lines between Syracuse and Catania, the dispirited group was taken prisoner.

The unsuccessful raid was described by one of its members, Eric Newby, as the first chapter of his memoir Love and War in the Apennines.