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.