June 25th - On This Date - RN Submarine Service

1915	H8	Submarine HMS H8 completed
1945	Alderney	Submarine HMS Alderney launched
1946	Tabard	Submarine HMS Tabard completed
1921	HMS K15	K15 was moored alongside the light cruiser HMS Canterbury, in the tidal basin at Portsmouth. Most of the crew were on leave when a watch keeper discovered that the submarine was sinking, with the stern already awash. The watch were quickly roused and scrambled aboard the Canterbury. The submarine slowly submerged amid streams of bubbles. The accident was caused by hydraulic oil expanding in the hot weather and contracting as the temperature dropped causing a loss of hydraulic pressure and causing vents to open.
1940	HMS Snapper	HMS Snapper torpedoes and sinks the German armed trawler V 1107/Portland south of Stavanger, Norway.
1941	Parthian	HMS Parthian torpedoes Vichy French submarine Souffleur
1944	HMS Truculent	HMS Truculent sinks a Japanese sailing vessel with gunfire in the Malacca Strait.
1945	HMS Selene	HMS Selene sinks two Japanese coasters and a Japanese sailing vessel with gunfire in the Gulf of Siam.

SAB