The Casemate was built in 1886 to serve as an ammunition store for the guns. It also acted as a shelter for gunners and infantry groups stationed at the Fort. It is situated at the highest point of the hill and served the 9.2-inch R.M.L. guns nearby. The casemate has four rooms, one of the rooms held the entrance to a tunnel that led to underground store rooms beneath the first emplacement. Lim Bo Seng, a war hero of Singapore, was a major brick supplier in the late 1930s, with his main client, the colonial government. Bricks supplied by Lim lay in certain sections of the casemates at the Fort. His other projects included the construction of Alexandra Hospital, the army barracks in Changi and many defence works in the 1930s.