At one point the highest grossing film of all time, Titanic was really the fortunate result of a hobby. In the words of James Cameron, “I made Titanic because I wanted to dive to the shipwreck, not because I particularly wanted to make the movie… when I learned some other guys had dived to the Titanic to make an IMAX movie, I said, ‘I’ll make a Hollywood movie to pay for an expedition and do the same thing’.”