Drinking and diving don't mix, but we've found one exception. At the Edivo Vina winery about an hour north of the Croatian seaside town of Dubrovnik, you need to slip into a wet suit for a cellar tour.That's because this winery stores and ages their – aptly named – 'Navis Mysterium' or 'Sea Mystery' wine – 20 meters (66 feet) under water.Sea Mystery wine begins life above ground as other wines do. The regional grapes are harvested, pressed and bottled,...