James Cameron: ~ Estimated $3 million, Deepsea Challenger
Filmmaker James Cameron was behind famous movies like Avatar, The Terminator, and Titanic. He is already such a wealthy guy but he has no plans of retiring anytime soon. He is currently working on a number of Avatar sequels. While many people love having a private yacht, Cameron is quite different because he owns a high-tech submarine. Cameron loves deep-sea exploration and he gets to go on deep seas dives on his Deepsea Challenger. Sources said that he spent around $3 million for his submarine. Cameron did several specials showcasing his dives post-Titanic.