Xoc explores the ocean''s wonders through the eyes of a great white as it treks from the Farallon Islands off the coast of California to the warm waters of Hawaii some 2,300 miles away. Along its journey, the 17-foot shark encounters natural prey and predators - from skittish seals to brazen orcas-as well as man-made impediments that threaten not only the giant fish, but the balance of ocean''s ecology.