The U.S. Coast Guard said one of its cutters is under way in Alaska waters on its third science mission this year.
The 420-foot Healy is a polar icebreaker based in Seattle.
An agency press release said the crew picked up supplies Sept. 28 in Dutch Harbor and headed north.
A science team will put out hydrographic moorings and recover others placed on earlier missions.
The crew of the Healy worked earlier this year with a Canadian coast guard ship to survey more than 4,600 miles of Arctic seafloor.
-- Associated Press