One of this city's hottest businesses these days is located inside the cool, climate-controlled confines of a former World War II military bunker on the south side of Hong Kong island.

There, in a 6,000-square-foot space that offers some of the best cellaring conditions in Hong Kong, Gregory De'Eb shelters expensive wines from the semitropical climate for a rapidly expanding clientele of oenophiles from Hong Kong, mainland China and elsewhere in Asia. At around 27,000 cases, his storage facilities are filled to capacity.