Petty Officer 1st Class Brian Rogers, an electrician’s mate, and Petty Officer 2nd Class Gavin Dunaway, an electronics technician, troubleshoot an issue with the diesel-electric propulsion plant aboard the Coast Guard Cutter Polar Star while underway in McMurdo Sound near Antarctica on Thursday, Jan. 11, 2018. The crew of the Seattle-based Polar Star is on its way to Antarctica in support of Operation Deep Freeze 2018, the U.S. military’s contribution to the National Science Foundation-managed U.S. Antarctic Program. U.S. Coast Guard photo by Chief Petty Officer Nick Ameen.