200121-N-PO203-0263 ARLINGTON, Va. (Jan. 21, 2020) During a special edition Office of Naval Research (ONR) Distinguished Lecture Series, Dr. Robert D. Ballard discusses 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)