Naval Submarine Base New London by the Submarine Escape Immersion Equipment in the 2000s. On January 21, 1954 the first nuclear-powered submarine, , was launched from Groton. "Nautilus" became the first vessel to transit the North Pole during a historic trip across the Arctic in 1958. "Nautilus" spent most of her career assigned to Submarine Squadron 10 located at State Pier in New London. It was retired from service in 1980. In 1982 "Nautilus" was designated a National Historic Landmark in Groton. It is permanently moored south of the main gate, attached to the U.S. Submarine Force Museum. Self-guided tours are available to the public
Ice cap climate polar and there are some communities that are situated in a transitional zone between the two climates, but barely qualify as a tundra. Some places like Antarctica had a different climate before having an ice cap climate. Under the Köppen climate classification, the ice cap climate is denoted as "EF". Ice caps are defined as a climate with no months above . Such areas are found around the north and south pole, and on the top of the highest mountains. Since the temperature never exceeds the melting point of ice, any snow or ice that accumulates remains there permanently, over