evidence: Rockall (/ˈrɒkɔːl/) is an uninhabitable granite islet in the North Atlantic Ocean. The United Kingdom claims that Rockall lies within its territorial sea[1] and is part of its territory, but this claim is not recognised by Ireland.[2][3] It and the nearby skerries of Hasselwood Rock and Helen's Reef are the only emergent parts of the Rockall Plateau. The rock was formed by magmatism as part of the North Atlantic Igneous Province during the Paleogene. [...] The United Kingdom of Great Britain and Northern Ireland claims Rockall along with a 12-nautical-mile-radius (22 km) territorial sea around the islet inside the country's exclusive economic zone (EEZ).[1] The UK also claims "a circle of UK sovereign airspace over the islet of Rockall".[1] The UK claimed Rockall on 18 September 1955 when "Two Royal Marines and a civilian naturalist, led by Royal Navy officer Lieutenant Commander Desmond Scott, raised a Union flag on the islet and cemented a plaque into the rock".[88] Prior to this Rockall was legally terra nullius.[89] In 1972, the British Island of Rockall Act formally annexed Rockall to the United Kingdom.[89] In May 2017, declassified documents revealed that the 1955 decision to claim the rock as UK territory was motivated by worries that it could otherwise be used by "hostile agents" to spy on the future South Uist missile testing range.[90]