(edit)The concept car developer Rinspeed calls its "sQuba" the first real submersible car(edit) Rinspeed says its car can provide a stable "flight" at a depth of 30 feet."For three decades I have tried to imagine how it might be possible to build a car that can fly underwater," says Frank Rinderknecht, Rinspeed's 52-year-old CEO and a professed James Bond fan. "Now we have made this dream come true." The car will be unveiled at next month's Geneva Auto Show.Rinderknecht says it is difficult to make a car watertight and pressure-resistant enough to be maneuverable underwater."The real challenge, however, was to...