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| HMS/M M3. M Class Submarine. She was laid down on the 4 December 1916 and was commissioned in July 1920. She was originally conceived as K20, but renamed prior to launch. M3's 12-inch gun was removed in Chatham in 1927-1928; her upper deck was modified to carry a casing with a conveyor belt to carry and launch over the stern 80 Type B mines which was then changed to 100. The mines were laid through a door at the stern. M3 proved to be a successful minelayer and was used in the design of the Porpoise class minelayers. From 9 May to 15 May 1926, M3 was used to generate electricity for the Royal Victoria Dock, Royal Albert Dock and King George V Dock in London during a general strike . M3 was sold on 16 February 1932. She was then scrapped at Newport in April 1932. |
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