The Southern Breakwater was constructed between 1898 and 1909 and was part of the huge and impressive engineering project to provide refuge to the British fleet. It was the first artificial harbour to be constructed in the C20th and is built using large granite blocks. It extends for 65m in length and is about 6m wide. There are two lighthouses, one at the far south western end of the breakwater and another towards the north eastern end. Two Coastal batteries were also constructed at either end of the breakwater during WWI. These survive substantially intact though the guns have been removed. (location accurate to the nearest 1m based on available information)