January 18th - On This Date - RN Submarine Service

1918	P511	Submarine HMS P511 launched
1921	L52	Submarine HMS L52 completed
1932	Rainbow	Submarine HMS Rainbow completed
1915	HMS E10	HMS E10 sailed from Harwich for operations NNW of Heligoland. No further contact was made with the submarine after parting company with HMS E5 at 1950 on the evening of the 18th. It is believed that E10 was destroyed by an enemy mine.
1916	H6	H6 became stranded on the Dutch Coast. The crew interned at Groningen.
1942	Porpoise	HMS Porpoise torpedoes and sinks the Italian merchant Citta di Livorno about 15 nautical miles north-east of Cape Maleka, Crete.
1943	HMS Unseen	HMS Unseen torpedoes and sinks the Italian naval auxiliary Sportivo 5 nautical miles bearing 20 of Zuara, Libya.
1945	HMS Shalimar	HMS Shalimar sinks four Japanese sailing vessels with gunfire south of the Malakka Strait.