Personal subs have tended to be acrylic spheres with pontoons, the bulbous transparent capsules offering exceptional views, but not much interior space. Besides looking clunky, these subs typically ...

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 ...