 On August 9, 2016 the UN Commission on the Limits of the Continental Shelf began its review of the submission., the United States has not ratified the UN Convention on the Law of the Sea (UNCLOS) and, therefore, is not yet eligible to file an official claim to an extended continental shelf with the UN Commission on the Limits of the Continental Shelf.In August 2007, an American Coast Guard icebreaker, the USCGC "Healy", headed to the Arctic Ocean to map the sea floor off Alaska.