A compass sits atop a nautical chart Jan. 3, 2020, aboard the U.S. Coast Guard Cutter Polar Star (WAGB-10) approximately 20 miles north of McMurdo Station, Antarctica. The crew of the Polar Star, a 399-foot heavy icebreaker, is working to break 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