The Coast Guard Cutter Polar Star sits hove-to in 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 breaks a channel to McMurdo Station for resupply. (U.S. Coast Guard photo by Petty Officer 2nd Class Grant DeVuyst)