Bloomberg.com features a story on private submarine owners and the market for luxury subs.
These submarines are not the cramped and steely subs that are used for deep-sea exploration, nor are they as spare and crowded as military subs.
These subs are designed to be as luxurious and stately as the yachts that carry them.
Sub owners are also secretive about their new toys. While there are over 100 luxury subs on (or under) the seas, details about who owns them and what their capabilities are is still a mystery.