From the U.S. Navy:
010605-N-0000X-004 North Pole (June 5, 2001) – The Los Angeles-class fast attack submarine USS Scranton (SSN 756) breaks through the Artic ice. For the first time in a third of a century, Scranton was one of two U.S. submarines to surface at the North Pole. Scranton and her crew broke through almost four feet of ice as a part of Atlantic Submarine Ice Exercise (LANTSUBICEX) 1-01, a three-ship exercise which demonstrated the U.S. Navy’s commitment to assure access to all international waters.