ARCTIC OCEAN - The Canadian Coast Guard Ship Louis S. St-Laurent trails the Coast Guard Cutter Healy as the two ships work their way farther north to research the floor of the Arctic Ocean Aug. 24, 2009.
The two ships are taking part in a multi-year, multi-agency Arctic survey that will help define the Arctic continental shelf.
(U.S. Coast Guard photo by Petty Officer Patrick Kelley)