The film explores the lives and journeys of two world-renowned free divers, Pipin Ferreras and Umberto Pelizzari. Both divers share a profound love for the ocean and have dedicated their lives to mastering the art of free diving, where athletes dive into the depths of the sea without the aid of breathing apparatus. While Pipin comes from a humble background in Cuba, often diving alone and relying on his natural talent and sheer determination, Umberto enjoys a more structured and scientific approach, born from his Italian heritage and years of disciplined training. Through stunning underwater cinematography, audiences witness how each diver faces unique physical and psychological challenges, setting new records and constantly pushing the limits of human endurance.

Their rivalry is as intense as their respect for one another; Pipin's methods are often unorthodox, driven by his fiery ambition, while Umberto's meticulous preparation exemplifies precision and mental fortitude. The film dives into their personal motivations, capturing moments of triumph, frustration, and discovery as they explore some of the most beautiful – yet perilous – underwater landscapes in the world. Alongside these narratives, it delves into the science of free diving, examining how the human body adapts to extreme conditions underwater. The juxtaposition of their techniques and philosophies offers rich insight into what drives these extraordinary men to undertake such high-risk endeavors in pursuit of their passions.