Bouvet Island of establishing a manned meteorological radio station, but a suitable location could not be found. By then both the flagpole and hut from the previous year had been washed away. The Third "Norvegia" Expedition, led by Hjalmar Riiser-Larsen, arrived the following year and built a new hut at Kapp Circoncision and on Larsøya. The expedition carried out aerial photography of the island and was the first Antarctic expedition to use aircraft. The "Dependency Act", passed by the Parliament of Norway on 27 February 1930, established Bouvet Island as a dependency, along with Peter I Island and Queen Maud Land. The
Bouvet Island eared seal was protected on and around the island in 1929 and in 1935 all seals around the island were protected. In 1955, the South African frigate "Transvaal" visited the island. Nyrøysa, a rock-strewn ice-free area, the largest such on Bouvet, was created sometime between 1955 and 1958, probably by a landslide. In 1964 the island was visited by the British naval ship HMS "Protector". On 17 December 1971, the entire island and its territorial waters were protected as a nature reserve. A scientific landing was made in 1978, during which the underground temperature was measured to be . In