High Quality Content by WIKIPEDIA articles! HMS E31 was a British E class submarine built by Scotts, Greenock. She was laid down in December 1914 and was commissioned on 8 January 1916. HMS E31 was involved in a curious incident when she was operating with the sea plane carrier Engadine in the North Sea in an air raid on the Zeppelin sheds at Tondern on 4 May 1916. HMS E31 surfaced and spotted Zeppelin L 7. She dived to avoid attack.

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