Chu Ting, a low-level diver, is betrayed by his fiancée, who pushes him into the deep sea during a maritime disaster. Against all odds, he survives and washes ashore on a deserted island. Relying on his advanced technical skills and courage, he slays giant crocodiles and obtains rare treasures. Aboard the heavy-duty trawler Black Knight, he salvages rare marine products worth hundreds of billions, strikes back against powerful capital interests, and rises from a penniless young man to ruler of the ocean. Despite his immense wealth, he holds fast to his principles, rescues millions of disaster victims across the sea, and builds an ecological haven on the deserted island, writing a legendary tale of the deep sea.