 Complete the following phrase:  One twin-gun turret was built as Batteria Amalfi on the Cavallino coast northeast of Venice. Construction began in September 1915 and took 17 months to complete. Equipped with a pair of Vickers-Terni guns, the turret was installed on the roof of a concrete bunker that contained the ammunition, and the sleeping quarters for the artillerymen manning the turret. Electrical generators and the hydraulic pumps were in separate structures connected to the main bunker by tunnels. At their thickest point the bunkers walls were deep and its roof was thick. The frontal armor of the turret was thick, its sides were protected by armor and it had a roof thick. The guns in the turret had a maximum elevation of 20. The turret could revolve 360, which allowed it to provide fire support for the Italian forces within range during the 