Events

1905	A 6 (I 16)	Commissioned

1906	B 10 (I 20)	Launched

1912	D 8 (I 78)	Completed

1922	H 42	Sunk in Collision with HMS Versatile off Gibraltar As part of the 3rd Submarine Flotilla H42 had spent Christmas 1921 in Portsmouth before sailing in January 1922 for exercises in the Mediterranean. H42 surfaced just off Gibraltar 120 yards in front of the destroyer HMS Versatile who at that time was cruising at 20 knots. The Destroyer was unable to take avoiding action and ploughed into the submarine almost slicing her in two.

1942	Unison (P 43)	HMS Unison torpedoes and sinks the Italian tanker Zeila off Cape Spartivento.

1943	Sahib (P 212)	HMS Sahib torpedoes ans sinks the small Italian merchant Tosca west of Cape Calava, Sicily, Italy.

1943	Stonehenge (P 232)	Launched

1943	Talent (P 322) / Zwaardvisch (Dutch)	Transferred to the Royal Netherlands Navy.

1944	Urtica (P 83)	Launched

1945	P 553	Sunk as target

Class:	1935 - 1970: Improved S Class
Built By:	Cammell Laird (Mersey)
Build Group:	S3
Fate:
HMS Stratagem sailed from Trincomalee on 10th November 1944 with orders to patrol in the vicinity of Malacca where it was believed the Japanese were loading ships with bauxite ore. On the afternoon of the 18th Stratagem attacked and sank the tanker Nichinan Maru. On 22nd November a Japanese aircraft spotted the submarine and directed a destroyer to where it had dived. Just after midday the destroyer attacked, the first depth charge causing the submarine's bow to strike the bottom. The submarine was plunged into darkness and the forward part began to flood. Attempts to shut the watertight door to the forward compartment failed and the crew were forced to make their escape. Ten crew managed to escape, of which eight were taken Prisoner of War. Only three of these (who were taken to Japan) survived captivity. The other five were executed in Singapore by the Japanese.

RN Subs