High Quality Content by WIKIPEDIA articles! HMS E21 was a British E class submarine built by Vickers, Barrow-in-Furness. She was laid down on 29 July 1915 and was commissioned on 1 October 1915. HMS E21 was sold on 14 December 1921. The British E class submarines started out as improved versions of the British D class submarine. All of the first group and some of the second group were completed before the outbreak of World War I.

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