North Pole Since 2002, the Russians have also annually established a base, Barneo, close to the Pole. This operates for a few weeks during early spring. Studies in the 2000s predicted that the North Pole may become seasonally ice-free because of Arctic ice shrinkage, with timescales varying from 2016 to the late 21st century or later. The sea depth at the North Pole has been measured at by the Russian Mir submersible in 2007 and at 4,087 m (13,410 ft) by USS "Nautilus" in 1958. The nearest land is usually said to be Kaffeklubben Island, off the northern coast of Greenland about
North Pole Marathon North Pole Marathon The North Pole Marathon is run over the classic 42.195 km (26.2 miles) marathon distance at the North Pole. The race is run on small, 4.22 km (2.62-mile) loop about 10 times over hard snow or the frozen ice of the Arctic Ocean. There are individual competitions with male and female divisions, and a team competition for teams of three or more. There is also an option to run a half marathon. The North Pole Marathon has been recognized by Guinness World Records as the "Northernmost Marathon on Earth". The first unofficial North Pole Marathon was a