CHARLESTON, S.C. -- An experiment in the age-old art of winemaking began last weekas a California winery submerged four cases of cabernet sauvignon in Charleston Harbor to see how the ocean affects the aging of the wine.Mira Winery of St. Helena, Calif., placed the bottles of wine in yellow steel-mesh cages and then submerged them offshore in an undisclosed location. In three months, the wine will be removed and subjected to chemical tests and tasting by experts to see what differences it has from wine aged on land. The winery could produce and sell underwater-aged wine in the future if the trial goes well.While wineries in Europe have experimented in recent years with ocean aging of wine, the idea is novel in the United States, said Jim "Bear" Dyke Jr., the Charleston resident who owns the Napa Valley winery. At least a handful of European wineries have produced underwater-aged wine, some of which has been sold in the U.S.Winemakers have long known that wine recovered from sunken ships has a unique taste, and the ocean is thought to have something to do with that.Dyke and his colleagues expect the water pressure, temperature and gentle swaying from currents to produce unique effects."This is a very exciting thing for me as a winemaker," said Gustavo Gonzalez, Mira's winemaker. "When you make wine, it's pretty much the same thing for everybody. You can change it up a bit but and see what happens and your cabernet may taste a little bit different from your neighbor's cabernet."The idea is to find out if ocean aging has the potential to change that, he said."We'll pull it out in late May and see what the effect of the water temperature, the water pressure and, more interesting to me, the swaying motion of the water does to the wine," he said.The wine has additional wax seals, and the cages are made of marine steel to withstand the ocean environment. The mesh allows the water to move around the bottles.The four cages are chained together and equipped with GPS tracking devices so they can be located in case they are moved by the currents or if an unauthorized diver decides to have an early wine and cheese party"It's the beginning of a testing process to see if we can do this in larger quantities for a longer period of time," Dyke said.