Part of the documentary series looking at the course of the First World War. This volume looks at the development of naval technology during the conflict, from the relatively old-fashioned battleship tactics of 1914, to the increased reliance by the Germans on U-Boat tactics and the adoption of a convoy system by the Allies. By the end of the war the first aircraft carriers were coming into service, a type of ship that would come to dominate naval warfare in the decades to follow. Includes rare archive footage.