High Quality Content by WIKIPEDIA articles! HMS C20 was a British C class submarine built by HM Dockyard, Chatham. She was laid down on 1 June 1908 and was commissioned on 31 January 1910. HMS C20 was sold on 26 May 1921 in Sunderland. The British C class submarines were the last class of petrol engined submarines of the Royal Navy and marked the end of the development of the Holland-class in the Royal Navy. Thirty eight were constructed between 1905 and 1910 and they served through World War I.

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