Emmy Award winner Jean-Michel Cousteau and his trusty team of divers turn their cameras on sharks and whales in these two episodes from the undersea series "Ocean Adventures." "Sharks at Risk" finds the Cousteau team studying the long-feared species in French Polynesia and South Africa. In "The Gray Whale Obstacle Course," Cousteau and the crew follow gray whales on their staggeringly long migration route from Baja California to the Bering Sea.