The story centers on Robinson, a veteran captain who commands underwater salvage vessels and finds life complicated by divorce and an estranged relationship with his young son. When Agora, the company he has relied on, cuts him and his close associates Kurston and Blackie loose, a glimmer of a future pulls them back into action. Kurston comes bearing a startling claim: Agora has unearthed the wreck of a World War II Type VIIC U-boat off the coast of Georgia, rumored to carry a fortune in gold, but past territorial disputes after the Russo-Georgian War stalled any salvage. This revelation rekindles old ambitions and the possibility of a windfall that could redefine all of their lives.
The crew’s mission hinges on a controversial new ally. A mysterious figure named Lewis agrees to fund the expedition in return for a substantial share, and he assigns his sharp-eyed executive Daniels to oversee the venture. Robinson’s plan gains urgency when he meets Tobin, a young man who claims to be Kurston’s friend and who delivers the grim news of Kurston’s suicide. Despite the shock, Robinson decides to bring Tobin along, hoping the kid’s presence might prove useful or at least shield him from the worst of what lies ahead. To pull this off, a mixed crew is assembled—half British, half Russian—with the promise of an equal stake in whatever spoils they recover.
Their transport to Sevastopol, in Crimea, marks the beginning of a long and perilous haul. The team acquires an antiquated Foxtrot-class submarine to reach the depths, a decision that will test nerves and seamanship in equal measure. Language barriers compound the danger; Blackie remains the lone bilingual link between Russian and English, and the resulting miscommunications ignite tensions that explode in a brutal fight when Fraser stabs Blackie. A catastrophic fire erupts, followed by an explosion that cripples the sub and costs the lives of Blackie and Gittens, a British crew member. Robinson is knocked unconscious and only awakens 18 hours later to a stark new reality: the Russians hold half the vessel while the British control the other, and the damaged drive shaft has left them largely immobile on the seafloor. Yet sonar suggests they are close to the U-boat, and salvage may still be possible if they can repurpose the Soviet submarine’s design to their advantage. Robinson also discovers Morozov, a Russian crewman who can speak English, a crucial bridge in the widening language gap.
Fraser, Peters, and Tobin press forward along the sea bed and eventually locate the wreck of the U-boat. They recover the drive shaft and the gold stash, but not without cost: Peters dies when a trench collapses and his air hose is severed. The team completes repairs and the sub resumes its perilous journey. But Daniels drops a chilling revelation: Agora plotted this entire expedition as a trap. Kurston—who is alive and who allegedly leaked the U-boat’s location—intended to lure the salvage team into capture so Agora could claim the prize. Now the crew must decide how far they’re willing to go to survive and protect the spoils.
With pursuit mounting, Robinson chooses a bold, dangerous path. He remains submerged and aims for Samsun, Turkey, threading a narrow trench to avoid the pursuing Russians. Daniels, desperate for rescue, drives Fraser to murder Zaytsev, the engine mechanic, in a move that strains every sense of trust aboard. The plan unravels as a second explosion rips through the hull, leaving leaks that threaten everyone aboard. Fraser and the remaining crew struggle to repair, but the damage proves too extensive. Daniels reacts with panicked calculation, locking a bulkhead and trapping three men to drown—yet he cannot escape his own binding in the next compartment.
Morozov acts to safeguard the trio in the torpedo section, where Robinson has hidden three escape suits. In a tense evacuation, Robinson frees Tobin and Morozov, explaining that he will try to follow in the third suit using an emergency lever. Morozov’s later revelation—that there was no emergency lever—confirms the calculated sacrifice: Robinson chooses to surface alone, to shield Tobin and Morozov from a trap they cannot outpace. As the third suit finally surfaces, it carries a portion of the gold and a personal memento—a photograph of Robinson’s family— sealing a poignant end to a mission defined by risk, hunger for fortune, and the cost of survival.
The film combines stark submarine realism with a quiet, human focus on what people will do for family, for loyalty, and for a chance at redemption under pressure. The crew’s dynamic—strained by language, divided by national loyalties, and tested by betrayals—grounds a story that moves from the claustrophobic darkness of the seabed to the emotional gravity of sacrifice and memory. The performances from the ensemble lend weight to the moral ambiguities at the heart of the quest, turning a high-stakes salvage operation into a meditation on risk, trust, and the ultimate price of choosing to live for those you love.
The cast includes Ben Mendelsohn, Jude Law, Scoot McNairy, and David Threlfall.
