Along with the Pier the Harbour Arm is the other major feature of Hastings beach front. It has featured in some of my posts already and will again. During construction in the 1890’s engineers found that the sea bed where the harbour arm ends changed from stable sandstone and gravel to the unstable mud of an old river bed. Faced with sprialling costs the project was abandoned. Although not completed the arm has helped build the long shingle beach that stretches between it and the pier. To see the difference 120 years makes compare this picture to this one here. That’s what longshore drift does.