Submarine Sounds Hector Castillo, a Navy Arctic Submarine Laboratory technician, sets up a hydrophone to communicate with submarines prior to their surfacing through the ice during the multinational maritime Ice Exercise in the Beaufort Sea, March 21, 2018. SHARE: Download: Full Size (0.88 MB) Tags: science, TECH, Navy Credit: Chief Petty Officer Darryl Wood VIRIN: 180321-N-HI707-701.JPG Photo Gallery