HMS C33

HMS C33 was a C-class submarine built by HM Dockyard, Chatham for the Royal Navy. She was laid down on 29 March 1909 and was commissioned on 13 August 1910.

Service history
C33 was involved in 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 it was abandoned after the loss of two C class submarines. In both cases, all the crew were lost.

C33 was one of the two C class submarines sunk because of the tactic. She was mined off Great Yarmouth while operating with the armed trawler Malta on 4 August 1915.