Shivering Sands Army Fort
Shivering Sands Army Fort [U7] was a Maunsell army fort built near the Thames estuary for anti-aircraft defence. It is made up of several once interconnected towers north of Herne Bay and is 9.2 miles from the nearest land. They can be viewed from Shoeburyness East Beach on clear, cloudless summer days.
The towers were built on land and floated out in 1943. Later in the war the equipment was replaced and removed soon after. The forts were abandoned in 1958. In the 1960s some weather equipment was installed in the searchlight tower. On 7 June 1963 a boat called the Ribersborg collided with one of the towers, which fell into the sea without harming anyone or sinking the boat.
In 1964 Screaming Lord Sutch set up Radio Sutch (a pirate radio station) on one of the old towers. However, he soon became bored and handed the project to his manager Reginald Calvert, who then expanded into all five towers that were still connected and called it Radio City.  After Calvert was killed by Oliver Smedley, his wife took over for a short time before the project was stopped and the towers again abandoned.
In 1990 the top of the searchlight tower was cut away so that helicopters could be used to maintain the weather equipment inside. In 1992 it was decided that the tower was no longer necessary for the continued operation of the instruments contained within, and a large buoy was placed next to the tower for the same purpose.
In August and September 2005, artist Stephen Turner spent six weeks living alone in the searchlight tower of the Shivering Sands Fort in what he described as "an artistic exploration of isolation, investigating how one's experience of time changes in isolation, and what creative contemplation means in a 21st-century context".
- Frank Jacobs (March 20, 2012). "All Hail Sealand". The New York Times.