For centuries, the North Pole remained elusive. Early attempts to reach it were primarily motivated by the search for a navigable route through the Arctic to Asia, known as the Northwest Passage. Later, explorers focused specifically on reaching the Pole itself. But for centuries, reaching it seemed impossible. The polar environment was extremely unforgiving. Located in the middle of the Arctic Ocean, the North Pole is covered by a vast expanse of sea ice which constantly changes due to wind, ocean currents and seasonal melts. Explorers tried to reach the pole using ships, dogsleds, and even traveling by foot. The first verified, and officially recognized expedition to reach the North Pole didn’t occur until 1926 (although several explorers claimed to have reached it earlier). It was first reached using the airship Norge, which flew overhead, but did not land on the surface.