Add Yahoo as a preferred source to see more of our stories on Google. There are a handful of ultra-high-net-worth pursuits that sound tempting, but don’t really make sense. They’re typically wildly ...

Triton’s Project Hercules, a concept unveiled at the Monaco Yacht Show, promises to rewrite the rules of design for mini-subs. It can dive to 656 feet, but its speed is even more noteworthy. Hercules ...

But the price tags, size and weight of the underwater craft have kept most potential buyers away from ownership. You have to be a billionaire and own a very large superyacht. Until now. U-Boat Worx’s ...