The Open Polar Sea was a conjectured ice-free body of water that was believed to encircle the North Pole. Although this theory was widely accepted and served as a basis for many exploratory expeditions aimed at reaching the North Pole by sea or discovering a navigable route between Europe and the Pacific via the North Pole, it was ultimately proven to be untrue.
Arctic shrinkage as of 2007 compared to previous years
The North Pole, also known as the Geographic North Pole, Terrestrial North Pole or 90th Parallel North, is the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface. It is called the True North Pole to distinguish from the Magnetic North Pole.
Temporary research station of German-Swiss expedition on the sea ice at the Geographic North Pole. Drillings at the landing site at 90°N showed an average ice thickness of 2.5 metres on April 16, 1990
This pressure ridge at the North Pole is about 1 km long, formed between two ice floes of multi-year ice.
Nansen's ship Fram in the Arctic ice
Peary's sledge party at what they claimed was the North Pole, 1909. From left: Ooqueah, Ootah, Henson, Egingwah, and Seeglo.