The discovery of the McMurdo Dry Valleys was an accidental result of the desire in polar exploration to find the South Magnetic Pole and the South Geographic Pole. James Clark Ross was astonished in 1841, after pushing his way through a thick collar of pack ice, to suddenly sail into an open body of water, McMurdo Sound, finding a large island (Ross Island) like Hawaii formed by a series of several large volcanoes, one of which was smoking and ready to erupt. He came here to find the South Magnetic Pole, which was too far inland to the west to reach easily on foot, as he had done years earlier in reaching the North Magnetic Pole. This opened the way for Robert Falcon Scott to come here in 1902–1904 with his Discovery expedition to make and attempt on the Pole. He set up camp on Ross Island and stayed for two years exploring various ways to reach the Pole. Albert Armitage, one his men, pushed a route directly west to see what was there and was astonished to find large valleys fully free of ice and snow, the McMurdo Dry Valleys.