Answer: Travel beneath the Arctic ice cap.
According to ussnautilus.org, On July 23, 1958, NAUTILUS departed Pearl Harbor, Hawaii under top secret orders to conduct "Operation Sunshine", the first crossing of the North Pole by a ship. At 11:15 pm on August 3, 1958, NAUTILUS' second Commanding Officer, Commander William R. Anderson, announced to his crew, "For the world, our country, and the Navy - the North Pole." With 116 men aboard, NAUTILUS had accomplished the "impossible", reaching the geographic North Pole - 90 degrees North.
Chad Vander Veen previously served as the editor of FutureStructure, and the associate editor of Government Technology and Public CIO magazines.