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HMS Seahorse (98S)
HMS Seahorse.jpg
HMS Seahorse
Career (UK) Royal Navy Ensign
Name: HMS Seahorse
Builder: Chatham Dockyard
Launched: 15 November 1932
Identification: Pennant number: 98S
Fate: Sunk 7 January 1940
General characteristics
Displacement: 640 tons surfaced
935 tons submerged
Length: 202 ft 6 in (61.7 m)
Beam: 24 ft (7.3 m)
Draught: 10 ft 6 in (3.2 m)
Propulsion: Twin diesel/electric
Speed: 13.75 knots surfaced
10 knots submerged
Complement: 36 officers and men
  • 6 × forward 21-inch torpedo tubes
    • 12 × torpedoes
  • 1 × 3-inch gun
  • 1 × 20mm cannon
  • 1 × .303-calibre machine gun

HMS Seahorse was a group one British S-class submarine that was lost at sea with all hands in Heligoland Bight, North Sea, probably on the 7 January 1940, during the Second World War.

On 26 December 1939 she sailed from Blyth for patrol off the east coast of Denmark. Four days later she shifted position to the entrance of the Elbe. She did not return on her due date of 9 January 1940. It was first thought that she had been mined but German records, examined after the war, suggest she was the victim of the German First Minesweeper Flotilla which reported a sustained depth charge attack on an unidentified submarine on 7 January 1940.[1] It is however also possible that she was rammed and sunk by the German Sperrbrecher IV/Oakland south east of Helgoland on 29 December 1939.[2]

See also


  1. Submarine losses 1904 to present day, RN Submarine Museum, Gosport
  2. HMS Seahorse,

Coordinates: 56°42′N 0°52′E / 56.7°N 0.867°E / 56.7; 0.867

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