evidence: Located 300 kilometers from St Kilda, Scotland, the tiny uninhabited islet of Rockall is 29 meters high and measures just 31 by 25 meters. But despite its remoteness and inaccessibility, it is officially claimed by four European nations. The United Kingdom, Ireland, Denmark (on behalf of the Faroe Islands), and Iceland all claim the rock because of the large amounts of oil and natural gas believed to be buried in the continental shelf, which could be worth as much as $160 billion U.S. dollars. [...] The rock was then largely forgotten until September 18, 1955, when it became the last territorial expansion of the British Empire. A Royal Navy helicopter lowered three men onto the islet, where the Union Flag was raised and a plaque attached to the rock. At the time, the British government was performing weapons testing and was worried that the Soviet Union would use the unclaimed rock to place surveillance equipment. On February 10, 1972, Rockall officially became administratively part of the Scottish Isle of Harris. [...] Rockall lies 301 kilometres (187 miles), or 162 nautical miles west of the uninhabited Scottish island of Soay. There are no scheduled services to Rockall and visitors must arrive by private boat or helicopter.