I got interested when Ballard found the wreck. I bought every magazine I could find (on a 10-year-old's budget) and watched every documentary I could. Before that I had seen SOS Titanic. But the discovery of the wreck made me want more. A rewatch of SOS Titanic (the original full version) led to A Night to Remember which led to Titanic 53 which led to Ballard's book (something like "How I Did It"), etc. etc.