ARCTIC OCEAN – Peter Koski places a system controller in a buoy Wednesday, Oct. 3, 2018, about 715 miles north of Barrow, Alaska, in the Arctic. The system controller sends commands to an ice tethered profiler below the ice and transmits data, including temperature, current, depth and salinity back to scientists in the United States. Koski is one of about 30 engineers and scientists aboard the U.S. Coast Guard Cutter Healy (WAGB-20) in the Arctic deploying 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)