The Coast Guard Cutter Polar Star, a heavy icebreaker home-ported in Seattle, transits McMurdo Sound near Ross Island, Antarctica, in support of Operation Deep Freeze 2015, Jan. 9, 2015. Deep Freeze, a multi-agency operation, is the military component of the U.S. Antarctic program, which is managed by the National Science Foundation. (U.S. Coast Guard photo by Petty Officer 1st Class George Degener)
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