High Quality Content by WIKIPEDIA articles! HMS E12 was a British E class submarine built by HM Dockyard, Chatham. She was laid down on 16 December 1912 and was commissioned on 14 October 1914. She cost 101,900. HMS E12 became trapped in anti submarine nets in the Dardanelles. Her forward hydroplanes became entangled which sent her down to 245 feet. At the time, it was the greatest depth achieved by any British submarine. E12 managed to surface only to come under fire by shore batteries. She avoided further damage.

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