Fireman Matthew Beal and Petty Officer 2nd Class Ryan Copeland, a machinery technician, conduct maintenance on the hydraulic oil purifier in the Coast Guard Cutter Polar Star's motor room while the ship is hove-to in the ice near McMurdo Station, Antarctica, Jan. 14, 2015. Polar Star's crew is underway in support of the U.S. Antarctic Program, managed by the National Science Foundation. (U.S. Coast Guard photo by Petty Officer 1st Class George Degener)
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