HMS K7 was a K class submarine

British K class submarine

The K class submarines were a class of steam-propelled submarines of the Royal Navy designed in 1913. Intended as large, fast vessels which had the endurance and speed to operate with the battle fleet, they gained notoriety, and the nickname of Kalamity class, for being involved in many accidents....

 built by HM Dockyard

HMNB Devonport

Her Majesty's Naval Base Devonport , is one of three operating bases in the United Kingdom for the Royal Navy . HMNB Devonport is located in Devonport, in the west of the city of Plymouth in Devon, England...

, Devonport. She was laid down on 8 November 1915 and commissioned in July 1917.

K7 was involved in the accident with the 4th Light Cruiser Squadron. She was also involved in the Battle of May Island

Battle of May Island

The Battle of May Island is the name given to the series of accidents that occurred during Operation E.C.1 in 1918.Named after the Isle of May, an island in the Firth of Forth, close by, it was a disastrous series of accidents amongst Royal Navy ships on their way from Rosyth in Scotland to fleet...

 exercise. K7 was damaged in the exercise by running over the sinking .

K7 was sold on 9 September 1921 at Sunderland.