It was over the crown of the base of the forward conning tower. The sides of the conning tower were thick. This was located aft of the conning tower. The armor protecting each conning tower was . I guns in twin unarmoured turrets, one forward and one aft of the conning tower. The armour of the conning tower was thick. Another improvement was the conning tower fairwater. They also received a streamlined sail in place of the traditional conning tower fairwater. It was installed on the starboard side of the conning tower. Thus the large bulk of the conning tower fairwater became a liability. They boarded the vessel and entered through the conning tower. The armour protecting the conning tower was 138 millimetres thick. This equipment was installed on the starboard side of the conning tower. The walls of the rear conning tower were six inches thick. They also received a streamlined "sail" in place of the traditional conning tower fairwater.