On this edition of Conversations, Robert D. Ballard talks with host Dan Skinner about “Into the Deep: A Memoir from the Man Who Found Titanic.” Ballard has conducted 157 deep-sea expeditions and is a pioneer in the development of advanced deep submergence and telepresence technology. He also discovered hydrothermal vents, the wreck of the PT 109, ancient ships and artifacts in the Black Sea, and many other famous sites and phenomena.