In a small coastal town in Japan, a hidden and controversial practice unfolds. The story follows Ric O'Barry, a passionate activist, who was once a trainer for dolphins in captivity. Haunted by his past, O'Barry teams up with an elite team of filmmakers, deep-sea divers, and special effects experts to document the brutal secret of Taiji, where thousands of dolphins are captured and slaughtered annually. They meticulously plan a covert operation to penetrate the heavily-guarded cove and capture footage that would expose the dark side of the dolphin hunting industry to the world.

As the team navigates through legal and physical dangers, the narrative highlights the contrasting perspectives of tradition versus conservation. It underscores the emotional struggle and ethical dilemma faced by the townspeople and the activists. The film raises critical questions about environmental responsibility, animal rights, and the implications of such practices on global dolphin populations. The team’s journey sheds light on the broader impact of their mission, aiming not only to unveil the truth but also to ignite a global movement for change.