An earthquake has set off an oil spill on the ocean floor, and Blue Ocean Bob faces his toughest challenge yet. After seeking advice from Doc the turtle, Bob musters the courage to dive down and repair the damage alongside his mentor, Mary Marine. But when Mary is called away to a distant island, Bob has to put his fears aside and step into his mentor’s shoes. This is the third early chapter book in a series that provides children with an introduction to timeless principles of achievement.