Voyage to the Bottom of the Sea named for the radio message he sent to the Chief of Naval Operations to announce that "Nautilus" had reached the pole. His second book about these missions, "The Ice Diaries: The Untold Story of the Cold War's Most Daring Mission" (with Don Keith), was completed shortly before Anderson's death. This second book includes many previously classified details. On March 17, 1959, the nuclear submarine , under the command of Commander (later Vice Admiral) James F. Calvert, became the first submarine to surface at the North Pole. While at the Pole, her crew scattered the ashes of Arctic explorer Sir Hubert
North Pole will be entirely free of ice in the summer. This may have significant commercial implications; see "Territorial Claims," below. The retreat of the Arctic sea ice will accelerate global warming, as less ice cover reflects less solar radiation, and may have serious climate implications by contributing to Arctic cyclone generation. Polar bears are believed to travel rarely beyond about 82° North owing to the scarcity of food, though tracks have been seen in the vicinity of the North Pole, and a 2006 expedition reported sighting a polar bear just from the Pole. The ringed seal has also been seen at