

To put it briefly, this island was illegally placed in the international waters of the North Sea, but such restrictions were overlooked in a time of war. In contrast to the original plan to locate the tower within the sovereign territory of Great Britain this fortress was situated at a distance of approximately 7 nautical miles from the coast, which is more than double the then internationally accepted 3 mile range of territorial waters. One of these forts, consisting of concrete and steel construction, was the now famous Roughs Tower, situated in the North Sea. They were situated along the east coast of England, on the edge of British territorial waters. These sea forts housed enough troops to man and maintain anti-aircraft weaponry designed to shoot down German aircraft and missiles.

Some of these forts were built illegally in international waters. During the Second World War, the British government built several Fortress islands in the North Sea to defend its coasts from German invaders.
