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BYRON PITTS (ABC NEWS) (Off-camera) Tonight we are celebrating World Ocean Day with actor Adrian Grenier. You can watch him of course in theaters right now in the new "Entourage" movie. But tonight, with an altogether different kind of adventure for Mission Blue and our sister network Fusion, he's taking the plunge into the shark-infested waters that happen to be a precious breeding ground for many species facing the threat of extinction. [ABSTRACT FROM PUBLISHER]