HMS C27

HMS C27 was a British C class submarine built by Vickers, Barrow. She was laid down on 4 June 1908 and was commissioned on 14 August 1909.

Service history
HMS C27 along with the trawler Princess Louise (ex-Princess Marie Jose) sank SMS U-23 (Germany) in the Fair Isle Channel between Orkney and Shetland on 20 July 1915 during the U-boat trap tactic.

The tactic was to use a decoy trawler to tow a submarine. When a U-boat was sighted, the tow line and communication line was slipped and the submarine would attack the U-boat. The tactic was partly successful, but was abandoned after the loss of two C class submarines. In both cases, all the crew were lost.

HMS C27 was involved in the Baltic operations from 1915 to 1918.

HMS C27 was scuttled on 5 April 1918 outside Helsinki (Helsingfors) south of the Harmaja Light (Gråhara) to avoid seizure by advancing German forces. HMS C27 was salvaged for breaking up in Finland in August 1953.