A group of old high school friends—Dan, his wife Amy, their infant daughter Sarah, along with
married couple Lauren and Zach, commitment-phobic James, and recent addition Danny—reunite for a weekend sailing trip aboard a luxurious yacht owned by wealthy playboy Dan. The reunion is initially cheerful, filled with nostalgia, drinks, and basking in the open ocean sun. However, simmering tensions and past romantic histories soon bubble to the surface, particularly between Amy and her former flame James, creating an undercurrent of psychological discomfort among the group.Seeking a refreshing swim, the friends anchor miles from the nearest coastline. While most of the group eagerly jumps into the crystal-clear water, Amy initially hesitates due to a deep-seated, paralyzing phobia of the ocean, but she is eventually coaxed in. Shortly after everyone is splashing in the sea, a catastrophic oversight occurs: nobody lowers the yacht’s swimming ladder, and the high-sided hull makes it impossible for anyone to climb back aboard.Panic immediately sets in as the group realizes their grave predicament. Their phones, wallets, and safety equipment are all locked inside the cabin out of reach. Attempts to tread water and scream for help prove entirely futile given their isolated location. The psychological toll quickly shatters their camaraderie. Tempers flare, accusations fly, and desperation mounts as hours tick by under the relentless sun. Zach, overwhelmed by
claustrophobia and panic, attempts a reckless, frantic swim toward a distant oil rig, only to vanish into the vast expanse of the sea, leaving the remaining friends devastated and terrified.As night falls, the temperature drops, and exhaustion takes a severe physical and mental toll. Sarah remains locked alone in her cabin crib, crying helplessly, forcing the desperate parents to listen from the water below. In a series of agonizing, emotional reckonings, secrets are laid bare. Driven by profound guilt and a desire to save the others, James uses a shard of metal found floating in the water to try and scale the ship's rudder, injuring himself severely in the process. He ultimately manages to breach the deck, saving the surviving friends from hypothermia and drowning. However, the psychological scars run impossibly deep, and the reunion ends in tragedy, forever fracturing their lives as they return to shore haunted by the harrowing hours spent drifting at sea.