Time Out says
Sunk off the coast of Novigrad with days of World War II coming to an end, the HMS Coriolanus served in North Africa before taking part in suspected spying activities in this part of Istria. In May 1945, it hit a mine and sank. Now upright on the seabed about 25 metres deep, it is a popular dive site. A club such as Zeus Faber in Lanterna, facing Novigrad from across the Mirna estuary, can take you out to the wreck and also rent out equipment. Beginners may explore the shallower waters around Lanterna, with its wealth of flora and fauna.