Coast Guard Capt. Michael Davanzo, commanding officer of the Cutter Polar Star, reviews the paper chart track line as the vessel approaches the National Science Foundation's McMurdo Station, Jan. 16, 2017. The Polar Star and its crew are an integral part of the yearly operation to resupply two of NSF's three research stations in Antarctica.

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Photo credit: © Chuck Little / Alamy / Afripics
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