Military Wiki
HMS Unshaken (P54)
HMS Unshaken.jpg
An aerial view of HMS Unshaken underway in May 1942
Name: HMS Unshaken
Builder: Vickers Armstrong, Barrow-in-Furness
Laid down: 12 June 1941
Launched: 17 February 1942
Commissioned: 21 May 1942
Fate: scrapped March 1946
General characteristics
Class & type: U-class submarine
Displacement: Surfaced - 540 tons standard, 630 tons full load
Submerged - 730 tons
Length: 58.22 m (191 ft)
Beam: 4.90 m (16 ft 1 in)
Draught: 4.62 m (15 ft 2 in)

2 shaft diesel-electric
2 Paxman Ricardo diesel generators + electric motors

615 / 825 hp
Speed: 11.25 knots maximum surfaced
10 knots (19 km/h) maximum submerged
Complement: 27-31
Armament: Four bow internal 21-inch (533 mm) torpedo tubes - 8 - 10 torpedoes
one - 3-inch (76 mm) gun

HMS Unshaken (P54) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. She has been the only vessel of the Royal Navy to bear the name Unshaken.


After a period operating off the coast of Norway, Unshaken spent most of her wartime career in the Mediterranean. Whilst in northern waters, on 5 July 1942, Unshaken radioed in a sighting and an exact description of a heavy German force - including the Tirpitz, Admiral Scheer and Admiral Hipper - at sea in pursuit of the ill-fated convoy PQ17 off north Norway. Hearing of these allied sighting reports (also made by the Russian submarine K-21 and a Catalina patrol aircraft) through intelligence, Admiral Raeder cancelled the sortie, ordering the surface fleet to return to port and left the Luftwaffe and U-boats to attack the convoy. The convoy lost 24 ships out of 40, but it could have been even worse for the convoy if the heavy force had remained at sea.

Unshaken also sank the German merchant Georg L.M. Russ off southern Norway, before being reassigned to the Mediterranean in late 1942.

Serving in the Mediterranean, she sank the Italian merchant ships Foggia and Pomo (the former Yugoslavian Nico Matkovic), the Italian torpedo boat Climene, the Italian sailing vessel Giovanni G., the Italian auxiliary patrol vessel No 265 / Cesena, and the Italian troop transport Asmara. She also damaged the Italian tanker Dora C.. She launched unsuccessful attacks against the French merchantman Oasis, the Italian merchant vessels Pomo, Nina and Campania, and the French passenger/cargo ship Cap Corse. Unshaken had a narrow escape after she was attacked by four torpedoes launched by the Polish submarine ORP Dzik. The Poles thought they were attacking an enemy submarine, but luckily the torpedoes missed their target. Unshaken captured the Italian submarine Menolti on the night that Italy ceased hostilities and escorted her to Malta. Lieutenant Commander Jack Whitton, Unshaken's commander, ordered the boat to surface after her hydrophone operator reported 'high speed revs'. He then decided to board the Italian vessel as her bridge was crowded with people and could not dive quickly. A shot from the deck gun across the bows of the Italian submarine was followed by a return burst from an automatic weapon which was suppressed by machine gun fire from the British boat. Unshaken then came alongside the Mentoli and a boarding party secured the conning tower hatch to prevent her from diving. There followed a robust verbal exchange in which the Italian skipper wanted to go to Brindisi, whereas Whitton insisted on Malta. The situation looked as if it might turn ugly until the loaded deckgun was pointed at the Italian commander from a distance of about 13 ft (4m).[1] After returning to home waters in mid-1944, Unshaken sank the German merchant Asien off Lista in Norway. Unshaken survived the war and was scrapped at Troon in March 1946.


  1. Field Marshall Lord Carver - The War in Italy 1943-1945, 2001, Sidwick and Jackson, ISBN 0 283 07294 6. pp. 60-62

This page uses Creative Commons Licensed content from Wikipedia (view authors).