The Shoeburyness Boom refers to two successive coastal defence barriers across most of the Thames Estuary in the mid-20th century, consisting of floating booms and pile barrages. As to the part perpendicular to the north shore most of the latter incarnation remains, and its nearest concrete mooring/patrol point 600 metres south. A 2 km stretch, this is designated a scheduled monument and marks the western edge of MoD Shoeburyness firing range, a restricted area. The rest was taken up in the 1960s.