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HMS Upholder
Career
Name:	HMS Upholder
Builder:	Vickers Armstrong, Barrow-in-Furness
Laid down:	9 December 1939
Launched:	1 October 1940
Commissioned:	22 February 1941
Fate:	sunk 20 July 1941
General characteristics
Displacement:	Surfaced - 540 tons standard, 630 tons full load Submerged - 730 tons
Length:	58.22 m (191 feet)
Beam:	4.90 m (16 ft 1 in)
Draught:	4.62 m (15 ft 2 in)
Propulsion:	2 shaft diesel-electric 2 Paxman Ricardo diesel generators + electric motors 615 / 825 hp
Speed:	11.25 knots max surfaced 10 knots max submerged
Complement:	27-31
Armament:	4 bow internal 21 inch torpedo tubes, 2 external 10 torpedoes 1 - 3 inch gun

HMS Upholder (P37) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. She was laid down on October 30, 1939, launched on July 8, 1940 by Mrs. Doris Thompson, wife of a director of the builders. The submarine was commissioned on October 31, 1940. She was one of four U-class submarines which had two external torpedo tubes at the bows in addition to the 4 internal ones fitted to all boats. They were excluded from the other boats because they interfered with depth-keeping at periscope depth.

Malcolm David Wanklyn VC DSO and Second Bar

She was commanded for her entire career by lieutenant-commander Malcolm David Wanklyn, and became the most successful British submarine of the Second World War. After a working up period, she left for Malta on December 10, 1940 and was attached to the 10th Submarine Flotilla based there. She completed 24 patrols, sinking around 120,000 tons of enemy shipping including the destroyer Libeccio after the Battle of the Duisburg Convoy, a cruiser, three U-boats (among which the Italian submarine Saint Bon), three troop transports, ten cargo ships, two tankers and a trawler. Wanklyn was awarded the Victoria Cross for a patrol in her in 1941 when he attacked a particularly well defended convoy and sank the 18,000 ton Italian liner SS Conte Rosso. She also damaged the Italian cruiser Giuseppe Garibaldi.

Upholder was lost with all hands on her 25th patrol, which was to have been her last before she returned to England. She left for patrol on 6 April 1942 and became overdue on 14 April. On 12 April she was ordered, with HMS Urge and HMS Thrasher to form a patrol line to intercept a convoy, although it is not known whether she received the signal.^[1] The most likely explanation for her loss is that she fell victim to depth charges dropped by the Italian Orsa class torpedo boat Pegaso North East of Tripoli on 14 April 1942 although no debris was seen on the surface. The attack was 100 miles away from Wanklyn's patrol area and he may have changed position to find more targets. It is also possible that the submarine was sunk by a mine on 11 April 1942 near Tripoli, when a submarine was reported as approaching a minefield.^[2]

1. ^ Royal Navy Submarine Museum
2. ^ HMS Upholder at uboat.net

• Submarines, War Beneath The Waves, From 1776 To The Present Day, by Robert Hutchinson
• Colledge, J. J. and Warlow, Ben (2006). Ships of the Royal Navy: the complete record of all fighting ships of the Royal Navy, Rev. ed., London: Chatham. ISBN 9781861762818. OCLC 67375475. 

v • d • e British U-class submarine
First Group	Undine | Unity | Ursula
Second Group	Umpire | Una | Unbeaten | Undaunted | Union | Unique | Upholder | Upright | Urchin | Urge | Usk | Utmost
Third Group	Ultimatum | Ultor | Umbra | Unbending | Unbroken | Unison | United | Universal | Unrivalled | Unruffled | Unruly | Unseen | Unshaken | Unsparing | Unswerving | Untamed | Untiring | Uproar | Upstart | Usurper | Uther | Vandal | Varangian | Varne | Vox | P32 | P33 | P36 | P38 | P39 | P41 | P47 | P48 | P52
Royal Norwegian Navy	HNoMS Uredd | HNoMS Ula
Soviet Navy	V 2 | V 3 | V 4
Polish Navy	ORP Dzik | ORP Sokół
Royal Netherlands Navy	HNMS Dolfijn
Free French Navy	Curie
Preceded by: T class - Followed by: P611 class List of submarines of the Royal Navy List of submarine classes of the Royal Navy