Petty Officer 1st Class David Edelson, a boatswains mate onboard the Coast Guard Cutter Healy, clears a path in the ice for an unmanned underwater system in the Arctic, July 29, 2017. The UUS is a small-unmanned platform that is capable of executing a pre-programmed mission underwater and then return to the surface for recovery of the vehicle and its recorded data. U.S. Coast Guard photo by Petty Officer 2nd Class Meredith Manning