HMS D7 was a British D class submarine

British D class submarine

There were plans for a further two, D9 and D10, but these were launched at Chatham Dockyard as HMS E1 and HMS E2.-See also:*Not to be confused with the United States D class submarine of 1909-1910.-Sources:...

 built by Chatham Dockyard

Chatham Dockyard

Chatham Dockyard, located on the River Medway and of which two-thirds is in Gillingham and one third in Chatham, Kent, England, came into existence at the time when, following the Reformation, relations with the Catholic countries of Europe had worsened, leading to a requirement for additional...

. D7 was laid down on 14 February 1910, launched 14 January 1911 and was commissioned on 14 December 1911.

D7 torpedoed U-45

SM U-45

SM U-45 was one of the 329 submarines serving in the Imperial German Navy in World War I.U-45 was engaged in the naval warfare and took part in the First Battle of the Atlantic....

 on the surface with a single shot from 800 yards off the North coast of Ireland on 12 September 1917. The torpedo was launched from the stern torpedo tube. Then on the 10 February 1918, D7 was mistakenly depth charged by HMS Pelican but she survived. D7 collided with a U boat in May 1918. Her periscopes were damaged but she escaped unscathed.

D7 was sold on 19 December 1921 to H. Pounds.