HMS Triton was a submarine of the Royal Navy named for the son of Poseidon and Amphitrite, the personification of the roaring waters. She was the lead ship of the T class of diesel-electric submarines. Her keel was laid down on 28 August 1936 by Vickers Armstrong at Barrow-in-Furness. She was launched on 5 October 1937, and commissioned on 9 November 1938.
HMS Hesperus was an H-class destroyer that had originally been ordered by the Brazilian Navy with the name Juruena in the late 1930s, but was purchased by the Royal Navy after the beginning of World War II in September 1939, commissioned in 1940 as HMS Hearty and then quickly renamed as Hesperus.
HMS P41 was a Royal Navy U-class submarine built by Vickers-Armstrong. She was transferred to the exiled Royal Norwegian Navy before completion and renamed HNoMS Uredd. She and one of the B-class in 1940 have so far been the only Norwegian submarines to have been sunk.
HMS Seahorse was a first-batch S-class submarine built for the Royal Navy during the 1930s. Ordered in March 1931, she was laid down at Chatham Dockyard in September 1931 and launched on 15 November 1932.
ORP Sokół was a U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. Shortly after launching in September 1940 she was to be commissioned by the Royal Navy as HMS Urchin, but instead was leased to the Polish Navy due to a lack of experienced submarine crews. A sister boat to Dzik, both boats operated in the Mediterranean from Malta, where they became known as the "Terrible Twins".
HMS Swordfish (61S) was a first-batch S-class submarine built for the Royal Navy during the 1930s. Commissioned in 1932, she was given the pennant number 61S and was assigned to the 2nd Submarine Flotilla.
HMS Severn (N57) was an ocean-going submarine of the River class. She was built by Vickers Armstrong, at Barrow, and launched on 16 January 1934. She was completed on 12 January 1935.
HMS Oxley was an Odin-class submarine of the Royal Australian Navy (RAN) then Royal Navy (RN). Very slightly off course, near Obrestad, on the south-western cape of Norway, she was hit by friendly fire seven days after the start of World War II costing 53 lives and leaving two survivors.
HMS Sturgeon was an S-class submarine that entered service with the Royal Navy in 1932. Ordered in 1930, she was laid down at Chatham Dockyard in January 1931 and launched on 8 January 1932. Commissioned on 27 February 1933, Sturgeon was assigned to the 2nd Submarine Flotilla.
HMS Starfish was a first-batch S-class submarine built for the Royal Navy during the 1930s. Completed in 1933, she participated in the Second World War.
HMS Sterlet was a second-batch S-class submarine built during the 1930s for the Royal Navy. Completed in 1938, the boat fought in the Second World War. The submarine is one of the 12 boats named in the song Twelve Little S-Boats. Thus far she has been the only ship of the Royal Navy to be named Sterlet.
HMS Sunfish was a Royal Navy S-class submarine which was launched on 30 September 1936 and served in the Second World War. Sunfish is one of 12 boats named in the song Twelve Little S-Boats.
HMS Clyde was a submarine of the River class. She was built by Vickers Armstrong, Barrow and launched on 15 March 1934. Building was completed on 12 April 1935. Initially planned to be part of a class 20 strong, Clyde would be the third and final of the boats to be completed and launched.
HMS Thistle (N24) was a T-class submarine of the Royal Navy. She was laid down by Vickers Armstrong, Barrow and launched in October 1938. She was sunk by the German submarine U-4 on 10 April 1940 near Skudenes, Norway.
HMS Unity was a U-class submarine, of the first group of that class constructed for the Royal Navy. The submarine entered service in 1938 and performed war patrols during the Second World War. On 29 April 1940, Unity was accidentally rammed and sunk in Blyth, Northumberland's harbour.
HNoMS Ula, previously HMS Varne, a British-built U-class submarine, and a member of the third group of that class to be built. She never actually served under the name Varne, being transferred before commissioning to the exiled Royal Norwegian Navy as HNoMS Ula (S300). In 1944 she sank a German U-boat during one of her patrols off Norway. She remained in Norwegian service and was scrapped in 1965.
Dundee International Submarine Memorial commemorates the 296 sailors and commandos lost on operations from the submarine base at Dundee in Scotland, HMS Ambrose, during World War II.
HMS Vivien (L33) was a V-class destroyer of the British Royal Navy that saw service in World War I and World War II.
Seeadler was the second of six Type 23 torpedo boats built for the German Navy. The boat made multiple non-intervention patrols during the Spanish Civil War in the late 1930s. During World War II, she played a minor role in the Battle of Kristiansand during the Norwegian Campaign of 1940. Seeadler spent the next couple of years escorting minelayers as they laid minefields and laying minefields herself. She also spent the latter half of 1941 escorting convoys through the Skaggerak. The boat returned to France in 1942 and was one of the escorts for the capital ships sailing from France to Germany through the English Channel in the Channel Dash. Seeadler then helped to escort one commerce raider through the Channel and was sunk by British forces while escorting another blockade runner in May.
Luchs was the fourth of six Type 24 torpedo boats built for the German Navy during the 1920s. The boat made multiple non-intervention patrols during the Spanish Civil War in the late 1930s. During World War II, she played a minor role in the Battle of Kristiansand during the Norwegian Campaign of 1940. Luchs was sunk in Norwegian waters in July by either a British submarine or a floating mine.
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