The first expedition to reach the geographic South Pole was led by the Norwegian explorer Roald Amundsen. He and four others arrived at the pole on 14 December 1911, five weeks ahead of a British party led by Robert Falcon Scott as part of the Terra Nova Expedition. Amundsen and his team returned safely to their base, and later learned that Scott and his four companions had died on their return journey. In the course of their journey they discovered the Axel Heiberg Glacier, which provided their route to the polar plateau and ultimately to the South Pole. The party's mastery of the use of skis and their expertise with sledge dogs ensured rapid and relatively trouble-free travel. Other achievements of the expedition included the first exploration of King Edward VII Land and an extensive oceanographic cruise. Roald Engelbregt Gravning Amundsen (1872-1928) was a Norwegian explorer of polar regions. He led the Antarctic expedition of 1910-12 which was the first to reach the South Pole, on 14 December 1911. In 1926, he was the first expedition leader for the air expedition to the North Pole. Amundsen is recognized as the first person, without dispute, as having reached both poles. He is also known as having the first expedition to traverse the Northwest Passage (1903-06) in the Arctic.