Built By: Armstrong Whitworth (Tyne)
Build Group: M
Fate: Sold for scrapping in February 1932.
M3 while she still had her gun
M3 while she still had her gun

Upload An Image Of This Boat

Started life as K20.

In 1927 M2 and M3 had their large 12-inch guns removed in the late 1920s to conform with the Washington Disarmament Treaty, which stated that no submarine should have larger than 8-inch calibre guns.

M3 was converted to an experimental minelayer, stowing her 100 mines on rails inside a large free-flooding casing outside the hull. The mines were laid over her stern by means of a chain-conveyor belt. M3 was finally taken out of service in April 1932, and scrapped in 1933.


04-12-1916 : Laid Down
19-10-1918 : Launched
09-07-1920 : Completed


This form is for you to comment on, or add additional information to this page. Any questions will be deleted. If you wish to ask a question or otherwise contact the Branch or the Webmaster. Please use the Contact Us page or ask your question on our Facebook Page

Please insert the result of the arithmetical operation from the following image:

Please insert the result of the arithmetical operation from this image. =


Note: All submissions are subject to webmaster approval prior to appearing on the page. As a SPAM prevention measure, any comments containing links to other sites will be automatically discarded