On the sun-drenched shores of Amorgos, a picturesque Greek island, two young boys, Jacques Mayol and Enzo Molinari, embark on a thrilling journey centered around the enchanting Mediterranean Sea. In the 1960s, Enzo dares Jacques to plunge underwater and retrieve a coin from the ocean floor. However, Jacques, favoring caution over daring exploits, declines the challenge—a seemingly innocuous choice that will reverberate through their lives.
As years unfold, both friends become deeply passionate about freediving, ultimately leading to a fervent rivalry. By the 1980s, Enzo has firmly established himself as a world champion, celebrated for his extraordinary feats after rescuing a diver trapped in a Sicilian shipwreck. His accomplishment ignites a longing to reconnect with Jacques, who has been immersed in studying human anatomy alongside dolphins amid the icy lakes of the Peruvian Andes.
The plot thickens with the arrival of Johana Baker, a captivating insurance broker drawn to Jacques' magnetic presence. Crafting a ruse to justify her attendance at the World Diving Championships in Taormina, Sicily, she seeks to rekindle their romance. Little do they all know that Jacques's bond with the ocean holds an allure that is deeply rooted in his very being.
As the diving championship looms, tension mounts between Jacques and Enzo, who are now set to battle it out in an intense competition where every meter counts. The competitive landscape is intensified when Enzo gifts Jacques a crystal dolphin—a token that signifies their lifelong friendship and the narrow margin that has come to define their journeys.
Johana's deception comes to light, prompting her to abandon her life in New York to join Jacques. Enthralled by legends of mermaids and their mystical allure, she embarks on an adventure that pushes them toward uncharted territories of human endurance.
As the World Diving Championships commence, Enzo's record-breaking dives send tremors through the diving community while raising alarm among experts regarding the limits of human capability. Jacques, too, faces his own battle as he is drawn into a complicated situation involving a distressed dolphin, leading him, Enzo, and a dive doctor to orchestrate a clandestine rescue mission to return the dolphin to the vastness of the ocean.
The stakes rise as divers strive to eclipse Enzo's phenomenal records, yet they all falter until Jacques’s astonishing dive plunges to an astounding depth of 400 feet (120 meters). With this record-breaking achievement, the rivalry intensifies, compelling Enzo to push his limits despite dire warnings from medical professionals regarding the dangers awaiting in those treacherous depths.
Tragedy unfolds when Enzo attempts his descent into the abyss only to find himself in peril. Jacques, feeling a deep connection to his friend, dives in a desperate bid to save him. Enzo’s haunting last words resonate in Jacques' mind: “It’s better down there.” What follows is a heart-wrenching tribute as Jacques confronts the weight of loss, choosing to carry Enzo’s lifeless body back to the depths which once ignited their shared passion.
In a profound act of acceptance, Jacques relinquishes Enzo’s remains to the ocean, sinking into its depths—a haunting moment that weighs heavily on his soul and leads to his own medical crisis. Luckily, medical personnel revive him, but a surreal journey begins within his mind, where visions of dolphins and watery realms merge with his turbulent emotions.
Meanwhile, Johana returns, burdened with the revelations of her pregnancy as she finds Jacques in a vulnerable state. Her pleas for him to remain take an emotional turn, but ultimately, they are stifled by Jacques’s unyielding desire to face the depths once more. The emotional tumult crescendos as Johana grapples with the gravity of his decision.
Uplifted by heart-wrenching tension, Johana makes the fateful choice to pull the release cord, watching with a heavy heart as Jacques plunges into the frigid abyss. The camera captures his tranquil expression as he descends, and in a moment of unexpected clarity, Jacques frees himself from constraints to merge with a dolphin, surrounded by the deep blue mystery.
The film culminates in an ambiguous ending, leaving the audience in contemplation about Jacques's fate—his journey into the unknown carries the weight of both sacrifice and transcendence. In an expanded American version, after this poignant departure, Jacques surfaces once more, leaving viewers to ponder the enigmatic reality in which he now exists.
