High Quality Content by WIKIPEDIA articles! 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. The group 1 boats of the E class cost 101,900 per hull but the price eventually increased when the second group entered service to 105,700 per hull. As submarine technology improved, the E class went through several modifications to install the new improvements which were all installed by the time the final group was under construction. The class served in the North Sea and the Baltic and Turkish operations while some served with Russian ships in Russian coastal waters before being scuttled to avoid capture by the communists who were gradually taking control of Russia. The E class served with the Royal Navy throughout World War I as the backbone of the submarine fleet and were eventually replaced by the British L class submarine. All the E class submarines were withdrawn from service by 1922.

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