Segment 1: Whitetip Reef Sharks. At the remote, lush, uninhabited Cocos Island, 300 miles off the coast of Costa Rica, Jonathan witnesses a nightly hunting ritual. Dozens of Whitetip Reef sharks join together into roving gangs to hunt fish in the reef. Sometimes the fish are pretty good at getting away, sometimes they aren't. Segment 2: The Kelp Forest. Off the coast of southern California, Catalina Island is known is one the greatest places in the world to see Kelp Forests. Jonathan travels to Catalina Island to explore these fantastic undersea forests of plants and meets the animals that live there, including a ray that attacks his camera! Segment 3: River of Wrecks. The St. Lawrence River connects the Atlantic Ocean with the Great Lakes and as such has been a major shipping channel for hundreds of years. The bottom of the river is littered with the remains of ships that ran aground or were lost during storms. Jonathan explores some of the wrecks and gets a unique look into the history of life along the river.