U.S. Coast Guard Petty Officer 3rd Class Caleb Garrett (left) explains position plotting Jan. 6, 2020, on a nautical chart with Seaman Christopher Vega on the bridge of the Coast Guard Cutter Polar Star (WAGB-10) approximately 10 miles north of McMurdo Station, Antarctica. The crew of the Polar Star, a 399-foot heavy icebreaker, is working to create a channel in the ice surrounding McMurdo Station in order to bring in refuel and resupply vessels as part of Operation Deep Freeze — the U.S. military’s contribution to the National Science Foundation-managed, civilian U.S. Antarctic Program. U.S. Coast Guard photograph by Senior Chief Petty Officer NyxoLyno Cangemi