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Dr Robert Ballard, National Geographic Explorer-at-Large
Following the publication of his new memoir, and ahead of a NatGeo TV special on his career, Dr Robert Ballard joins Josh to discuss his remarkable career. He shares the secret mission that lead him to discover the wreck of the Titanic, the even more significant deep-sea discovery he made, and how his work on the ocean floor informs our thinking about outer space and our future on Earth.