HMS E31 was a British E class submarine

British E class submarine

The British E class submarines started out as improved versions of the British D class submarine. All of the first group and some of the second group were completed before the outbreak of World War I....

 built by Scotts

Scotts Shipbuilding and Engineering Company

Scotts Shipbuilding and Engineering Company Limited, often referred to simply as Scotts, was a Scottish shipbuilding company based in Greenock on the River Clyde.- History :...

, Greenock

Greenock

Greenock is a town and administrative centre in the Inverclyde council area in United Kingdom, and a former burgh within the historic county of Renfrewshire, located in the west central Lowlands of Scotland...

. She was laid down in December 1914 and was commissioned on 8 January 1916.

Service history

HMS E31 was involved in a curious incident when she was operating with the sea plane carrier

Seaplane tender

A seaplane tender is a ship that provides facilities for operating seaplanes. These ships were the first aircraft carriers and appeared just before the First World War.-History:...

  in the North Sea

North Sea

In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 in an air raid on the Zeppelin

Zeppelin

A Zeppelin is a type of rigid airship pioneered by the German Count Ferdinand von Zeppelin in the early 20th century. It was based on designs he had outlined in 1874 and detailed in 1893. His plans were reviewed by committee in 1894 and patented in the United States on 14 March 1899...

 sheds at Tondern on 4 May 1916. HMS E31 surfaced and spotted Zeppelin L 7. She dived to avoid attack. While at periscope depth, it was observed that the Zeppelin was losing altitude as it had been hit by shells from the light cruisers and . HMS E37 surfaced to shoot the Zeppelin down and rescued seven survivors.

HMS E31 was sold on 6 September 1922.