175: The Big BOAT Interview: Hollywood legend James Cameron on the deep ocean, his enduring obsession with Titanic and buying into Triton Submarines

In this week's Big BOAT Interview, Stewart sits down with Canadian filmmaker James Cameron, the director of three of the highest-grossing films of all time: Titanic, Avatar and Avatar: The Way of Water. The pair discuss Cameron's love of exploration, why he decided to put his money where his mouth is by investing in Triton Submarines alongside hedge fund billionaire Ray Dalio, and what it was like to see the wreck of the Titanic looming out of the deep for the very first time. In 2012, Cameron became the first person to make a solo dive to Challenger Deep, the deepest point in any ocean, and talks about what it was like to be more distant from the rest of humanity than anyone else on earth. The filmmaker has lots more to discover in the deep sea, especially around hydrothermal vents, which he says is like "going to another planet".