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History
United Kingdom
Name	Tiara
Builder	Portsmouth Dockyard
Laid down	8 April 1943
Launched	18 April 1944
Identification	Pennant number P351
Fate	Scrapped June 1947
General characteristics
Class and type	T-class submarine
Displacement	1,290 tons surfaced; 1,560 tons submerged;
Length	276 ft 6 in (84.28 m)
Beam	25 ft 6 in (7.77 m)
Draught	12 ft 9 in (3.89 m) forward; 14 ft 7 in (4.45 m) aft;
Propulsion	Two shafts; Twin diesel engines 2,500 hp (1,900 kW) each; Twin electric motors 1,450 hp (1,080 kW) each;
Speed	15.5 kn (28.7 km/h; 17.8 mph) surfaced; 9 kn (17 km/h; 10 mph) submerged;
Range	4,500 nmi (8,300 km; 5,200 mi) at 11 kn (20 km/h; 13 mph) surfaced
Test depth	300 ft (91 m) max
Complement	61
Armament	6 internal forward-facing 21 inch (533 mm) torpedo tubes; 2 external forward-facing torpedo tubes; 2 external amidships rear-facing torpedo tubes; 1 external rear-facing torpedo tubes; 6 reload torpedoes; QF 4 inch (100 mm) deck gun; 3 anti-aircraft machine guns;

HMS Tiara (P351) was a Royal Navy Group Three T-class submarine laid down at Portsmouth Dockyard on 8 April 1943 and launched on 18 April 1944. However the war ended before she was completed and she arrived at Dover Industries for scrapping in June 1947 . Her sister vessel Thor was launched on the same day at Portsmouth dockyard and not completed either. She would have been the only ship of the Royal Navy to bear the name Tiara.^[1]