ARCTIC OCEAN – Peter Koski prepares a buoy for placement on the ice Wednesday, Oct. 3, 2018, about 715 miles north of Barrow, Alaska. Koski is an engineer aboard the U.S. Coast Guard Cutter Healy (WAGB-20) in the Arctic to deploy sensors and autonomous submarines to study stratified ocean dynamics and how environmental factors affect the water below the ice surface for the Office of Naval Research. The Healy, which is homeported in Seattle, is one of two ice breakers in U.S. service and is the only military ship dedicated to conducting research in the Arctic. (NyxoLyno Cangemi/U.S. Coast Guard)