The Coast Guard Cutter Polar Star cuts a channel into a field of fast ice in McMurdo Sound, Antarctica, Jan. 7, 2016. During Operation Deep Freeze 2016, the U.S. military's logistical support to the National Science Foundation-managed U.S. Antarctic Program, the Polar Star's mission is to create a navigable channel to McMurdo Station for several resupply vessels. (U.S. Coast Guard photo by Petty Officer 2nd Class Grant DeVuyst)