Yachts are one of those things that, the moment you get the extra --extra-- money to get one, you get one. No doubt about it, they're a great indicator of how rich you are. Is there any better way to show off than to have a mansion that can sail the seven seas? Probably not. Unless, if that mansion that can sail the seven seas can also dive into the seven seas. Here's the U-010, and it's a yacht that, upon command, can turn into a submarine.