The Titan submersible implosion was a tragic example of marine exploration going wrong. Today Dallas speaks to one of the world's leading marine archaeologists about Titan and the history of deep-sea submersibles leading up to it. Why and how did we begin exploring the ocean depths? What drives us on? And what lessons should be learned from Titan?

Edited by Tomos Delargy, Produced by Alex Carlon, Senior Producer Charlotte Long

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