In 1905, the Argentine government authorised a weather station on the island. In 1906, the CAP signed a lease with the Falkland Islands government, and following the 1908 annexation the company started to use British whaling licences and leases for land at Grytviken and Jason Harbour. Also in 1908, the CAP started looking to the South Sandwich Islands for the expansion of their business. Larsen adopted British citizenship in 1910. Argentina's first explicit claim to South Georgia was made in 1927 and to the South Sandwich Islands in 1938. Later developments Following the Argentine claims, the UK offered (in 1947, 1951, 1953 and 1954) to take the matter to the International Court of Justice in The Hague but this was turned down by Argentina. When Britain took the issue to the court unilaterally in 1955, Argentina declined to cooperate, citing a lack of jurisdiction. The British divided the Falkland Islands dependencies in 1962, in accordance with the newly signed Antarctic Treaty. Those areas south of 60°S became the British Antarctic Territory, while the remainder – South Georgia and the South Sandwich Islands – retained their previous status. Falklands War Argentina established a base, Corbeta Uruguay, on Thule Island at the far south of the South Sandwich Islands in November 1976. When this base was discovered by the British that December, the British protested diplomatically, and sent a task force (Operation Journeyman) to protect the Falkland Islands from potential invasion. On 19 March 1982, a group of 50 Argentines posing as scrap metal merchants landed at Leith Harbour on South Georgia aboard the ARA Bahía Buen Suceso and hoisted the Argentine flag. The British government responded by sending HMS Endurance with 22 Royal Marines to expel the Argentines, but they were held off to avoid increasing the tension. Further Argentine troops, led by Lieutenant Alfredo Astiz (known as the "blond angel of death") were landed and the British set up a station to monitor the activities there. Argentine forces invaded the Falkland Islands on 2 April 1982 and took Grytviken the following day, leaving 44 marines. Despite seizing Grytviken and Leith, the Argentines were not able to take the entire island and several British Antarctic Survey field camps remained in the hands of the United Kingdom throughout the length of the war. In response to the Argentine invasion, the British launched Operation Corporate (the recapture of the Falkland Islands) of which