HMS Tuna (N94)

HMS Tuna (N94) was a T-class submarine of the Royal Navy. She was laid down by Scotts, Greenock and launched on the 10 May 1940. She was equipped with German-built engines and spent her career in World War II in western European waters, in the North Sea and off the west coast of France. She took part in many war patrols and her crew received service medals for the boat's destruction of several U-boats.

Design and description
Tuna was ordered from Scotts Shipbuilding and Engineering Company on 9 December 1937, as part of an extension of the 1937 construction programme, with an initial four submarines ordered earlier that year in July. Tuna was part of a further three submarines to be ordered, along with Triad and Truant, which were ordered from another shipbuilder.

She was equipped with diesel engines produced by MAN SE, a German company. The engines had been delivered before the war, and spare parts were rare, members of the crew at least once creating replacement parts from other equipment while at sea.

Service
Tuna had a relatively active career, serving in the North Sea and off the French and Scandinavian coasts.

She sunk the 7,230-ton merchant Tirranna on 22 September 1940. The Tirranna was a Norwegian merchant ship that had been captured by the German armed merchant cruiser Atlantis, in the Indian Ocean. Tirranna had 292 on board when sunk, including at least 264 captured Allied sailors and a 16-strong German prize crew. Eighty-seven people died in the sinking, including one German. She also torpedoed and sank the German catapult ship Ostmark and the French tug Chassiron. She fired upon and sank the German submarine U-644 and attacked the German submarine U-302 and the Italian submarine Brin as well as two unidentified submarine contacts, all unsuccessfully. An attack also failed on the German tanker Benno, formerly the Norwegian Ole Jacob, which had also been captured earlier by the Atlantis.

In January 1941 she and the submarine Snapper were escorted by the captured French minesweeper La Capricieuse as far as Bishop Rock, Isles of Scilly. Snapper left for a different patrol area and was presumed lost after she failed to return. Later that month she engaged and pursued an unidentified surfaced U-boat at night for more than an hour. She fired the forward-mounted four-inch gun and damage was noted to the U-boat's conning tower. The German vessel returned fire with an aft-mounted gun, but no damage was reported to Tuna. The pursuit was called off after the further enemy vessels appeared, Tuna diving to avoid them.

In February 1942 she was ordered towards the Trondheim area along with HMS Trident to protect a convoy from enemy sorties from Swedish port. Although Tuna did not engage the enemy, Trident damaged the German cruiser Prinz Eugen.

On 30 November 1942, she sailed from Holy Loch, Scotland, taking Royal Marines to the Gironde estuary as part of Operation Frankton. She was to arrive on 6 December but was delayed due to bad weather and a minefield. She arrived at the estuary a day late, surfacing 10 mi from the mouth. The aim of the operation was for several canoes of marines to paddle 60 miles up the Gironde to attack German ships at Bordeaux; in the process of disembarking the canoes, one of the six canoes was damaged, leaving the submarine to return those marines while the remainder continued on the operation. The operation was a success although only Corporal Bill Sparks and Major Herbert Hasler survived. The mission led to formation of the Special Boat Service.

She returned to home waters for the first time in four war patrols on 18 November 1943. For the destruction of three U-boats during those patrols, her commanding officer, Lieutenant D. S. R. Martin, was awarded the Distinguished Service Order with two bars. Additionally, the Distinguished Service Cross was awarded to Lt (E) N. Travers, and the Distinguished Service Medal to four other members of the crew including Coxswain William J Stabb.

In August 1945, she attended the first British Navy week in a foreign port, in Rotterdam. Also there were the cruiser HMS Bellona, and the destroyers Garth and Onslow. Foreign vessels included two of the Dutch Navy submarines of the T-class, Dolfijn and Zeehond.

During the War the Borough of Aldershot adopted the Tuna as part of the Warship Week campaign.

Post war
Tuna survived the war and was sold to be broken up for scrap on 19 December 1945, a job carried out at Briton Ferry from June 1946.