HMS Trooper (N91)

HMS Trooper (N91) was a T-class submarine of the Royal Navy. She was laid down by Scotts, Greenock, and launched in March 1942. On 3 October 2024 it was reported HMS Trooper was discovered at a depth of 253 metres (830 ft) in the Icarian Sea in Greece.^[1][2]

HMS Trooper
History
United Kingdom
Name	HMS Trooper
Builder	Scotts, Greenock
Laid down	7 May 1940
Launched	5 March 1942
Commissioned	29 August 1942
Identification	Pennant number N91
Fate	Sunk 17 October 1943
Badge
General characteristics
Class & type	British T class submarine
Displacement	1,090 tons surfaced 1,575 tons submerged
Length	275 ft (84 m)
Beam	26 ft 6 in (8.08 m)
Draught	16.3 ft (5.0 m)
Propulsion	Two shafts Twin diesel engines 2,500 hp (1.86 MW) each Twin electric motors 1,450 hp (1.08 MW) each
Speed	15.25 knots (28.7 km/h) surfaced Nine knots (20 km/h) submerged
Range	4,500 nautical miles at 11 knots (8,330 km at 20 km/h) surfaced
Test depth	300 ft (91 m) max
Complement	61
Armament	Six internal forward-facing 21-inch (533 mm) torpedo tubes Two external forward-facing torpedo tubes Three external backward-facing torpedo tubes Six reload torpedoes 1 x 4-inch (102 mm) deck gun Three anti-aircraft machine guns
Notes	The wreck was discovered in October 2024 in the Icarian Sea in Greece, at a depth of 253 meters.

Career

Trooper spent most of her short career serving in the Mediterranean. She sank the Italian tanker Rosario, the Italian merchant ship Forli, a sailing vessel and the Italian submarine Pietro Micca. She also damaged two other enemy vessels, and unsuccessfully attacked the Italian merchant Belluno (the former French Fort de France).^[3]

On her first operation, she took part in Operation Principal, which used human torpedoes to sink Italian ships in Palermo harbour.

Trooper sailed from Beirut on 26 September 1943, on her 8th War Patrol to cover in the Aegean Sea off the Dodecanese islands. On 14 October she challenged Levant Schooner Flotilla F8 off Alinda Bay in Leros. She failed to return on 17 October and was reported overdue on that day. She was presumed lost on German mines around Leros, but her wreck was later discovered in the Icarian Sea.

The Germans claimed Trooper was sunk by Q-ship GA.45 on 15 October 1943. The submarine GA-45 attacked was actually HMS Torbay which escaped undamaged.^[4]

Discovery

HMS Trooper was discovered at a depth of 253 metres (830 ft) in the Icarian Sea, north of the island of Donousa in Greece. The submarine, found in three distinct sections (bow, mid-section, and stern), had likely been sunk by a German EMF mine containing 350 kilograms (770 lb) of Hexanite. This discovery, led by Greek researcher Kostas Thoctaridis, resolved an 81-year-old mystery, bringing closure to the families of the 64 crew members lost during the submarine's final mission.^[1][2]