HMS Seal (N37)

HMS Seal (N37)

HMS Seal was one of six ships of the Grampus-class mine-laying submarines of the Royal Navy. She served in the Second World War and was captured by the Kriegsmarine and taken into German service as U-B. She was the only submarine the Germans captured at sea during World War II.

Seal was laid down at the Chatham Dockyard on 9 December 1936, launched on 27 September 1938 and commissioned into the Royal Navy on 24 May 1939. During her entire British career, her commander was Rupert Lonsdale, for whom it was his second command.