Petty Officer 2nd Class Thomas Hansen, a diver aboard the Coast Guard Cutter Polar Star, lowers a remotely operated vehicle into the Ross Sea near Antarctica shortly before midnight on Tuesday, Jan. 16, 2018, to inspect the ship’s propellers and hull. The crew of the Seattle-based Polar Star is on deployment 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.