200121-N-PO203-0175 ARLINGTON, Va. (Jan. 21, 2020) Deep-sea explorer Dr. Robert D. Ballard spends time with Office of Naval Research (ONR) families prior to participating in a special edition ONR Distinguished Lecture Series on the role of deep submergence in Naval warfare–past, present and future. Acclaimed for his historic discovery of hydrothermal vents, the sunken R.M.S. Titanic and numerous other discoveries around the world, Ballard has maintained a 53-year relationship with ONR. (U.S. Navy photo by John F. Williams/Released)