HMS Unseen (P51)

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United Kingdom
NameHMS Unseen
BuilderVickers Armstrong, Barrow-in-Furness
Laid down30 July 1941
Launched16 April 1942
Commissioned2 July 1942
FateScrapped September 1949
General characteristics
  • Surfaced - 540 tons standard, 630 tons full load
  • Submerged - 730 tons
Length58.22 m (191 ft)
Beam4.90 m (16 ft 1 in)
Draught4.62 m (15 ft 2 in)
  • 2 shaft diesel-electric
  • 2 Paxman Ricardo diesel generators + electric motors
  • 615 / 825 hp
  • 11.25 knots (20.8 km/h) max surfaced
  • 10 knots (19 km/h) max submerged

HMS Unseen (P51) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.


Unseen spent most of her wartime career in the Mediterranean, where she sank the Italian merchants Zenobia Martini, Le Tre Marie and Rastello (the former Greek Messaryas Nomikos), the Italian naval auxiliary Sportivo, the German auxiliary submarine chaser UJ-2205 (the former French Le Jacques Coeur), the Italian sailing vessel Fabiola, the German minelayer Brandenburg (the former French Kita), the German nightfighter direction vessel Kreta (the former French Ile de Beauté) and the German barge F 541. Unseen also destroyed the wreck of the German merchant Macedonia and a salvage barge.

Unseen also launched unsuccessful attacks against the Italian merchant Saluzzo (the former French Tamara), and what is identified as an Italian Capitani Romani class cruiser.

Unseen survived the war and was scrapped at Hayle in September 1949.


  • "HMS Unseen (P 51)".
  • "Universal to Untamed". British submarines of World War II. Archived from the original on 11 July 2007.
  • Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
  • Hutchinson, Robert (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Day. London: HarperCollins. ISBN 978-0-00-710558-8. OCLC 53783010.

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