151130-N-N0101-003 AT SEA (Nov. 30, 2015) The stern of a Naval Oceanographic Office (NAVOCEANO) T-AGS 60-class vessel is photographed with a glider, left, in the distance. Gliders operate at speeds of approximately 0.5 knots and are highly susceptible to the environment, especially currents. They routinely dive to nearly 1,000 meters and can operate for up to four months, depending on environmental conditions and sensors utilized. (U.S. Navy photo/Released)