Black Sea

Robinson, a veteran underwater salvage captain, loses his job when Agora downsizes. The firing compounds his personal struggles as he remains estranged from his young son. The blow sets the stage for a dangerous pursuit of salvage and redemption.

Kurston comes forward with information that Agora had found a wrecked Type VIIC U-boat off Georgia. He suggests a multi-million gold cargo could be salvaged, but territorial disputes after the Russo-Georgian War complicate any salvage. The revelation rekindles the group's appetite for danger.

A wealthy backer enters the picture. Robinson and Blackie meet a mysterious financier named Lewis who will fund the expedition in exchange for a substantial share of the profits. He assigns Daniels to accompany the crew, creating a new layer of oversight and risk.

A young man named Tobin reveals himself as Kurston's ally and friend and informs Robinson that Kurston has apparently committed suicide. The news shocks Robinson and the crew and makes Tobin a risky addition to the mission. Nevertheless, they decide to bring him aboard.

The team is assembled with a half-British, half-Russian composition, and everyone is promised an equal share of the gold. Tobin's presence adds tension as language barriers complicate communication and trust. The fragile cohesion foreshadows the conflicts to come.

They sail to the Port of Sevastopol in Crimea to locate and acquire an antiquated Foxtrot-class submarine. Language barriers and mistrust begin to strain the crew as expectations clash under pressure. The acquisition marks the first concrete step toward the dangerous salvage.

With the Foxtrot secured, the crew takes command of a vessel that mirrors the era of the U-boat they seek. The Russians misread Tobin as a bad omen, believing he is a virgin even though he is an expectant father, worsening mistrust aboard. Communication remains choppy as the voyage begins.

A violent clash erupts as tensions boil over and Fraser stabs Blackie in the chest. A fire breaks out and an explosion cripples the submarine, killing Blackie and Gittens. Robinson regains consciousness eighteen hours later to find the sub divided, with Russians on one side and the British on the other.

Robinson discovers that they are on the sea floor with a damaged drive shaft, and sonar suggests they are near the wreck of the U-boat and may salvage its drive shaft for their use. The split crew struggles to operate the vessel despite the danger and dwindling air. The hunt for salvage continues under a looming threat of capture.

Fraser, Peters, and Tobin descend to the sea bed and locate the U-boat wreck, retrieving the drive shaft along with the gold cargo. Peters dies when he falls into a trench and his air hose is severed, cutting short his life and dreams of wealth. The crew presses on, determined to complete the mission even with rising casualties.

Daniels reveals that Agora deliberately leaked the U-boat's location to lure them and that Kurston, who is alive, is part of the trap. Robinson realizes that the betrayal means the mission isn't just about gold but also about survival and who can be trusted. He resolves to push ahead by staying submerged and racing toward Samsun in Turkey.

Desperation grows as Daniels forces Fraser to murder Zaytsev, the engine mechanic, in order to simplify operations. A second explosion tears through the sub, worsening its leaks and leaving the crew with far fewer hands. The situation pushes Robinson toward a perilous, solitary escape.

Morozov seals the final bulkhead, ensuring Daniels drowns while keeping Robinson, Tobin, and himself in the torpedo section safe for a last stand. Robinson retrieves three emergency escape suits and arranges a perilous plan to surface with Tobin and Morozov ahead of the others. He explains to Tobin that he will follow in the third suit, a hopeful if grim farewell.

Robinson and Tobin surface in separate suits, and Morozov reveals there was no emergency lever and that Robinson chose the risky sacrifice for Tobin's life. They emerge into open water with the gold and a memento—a photograph of Robinson's family—hinting at the cost of their choices. The third suit surfaces later, containing some of the gold and a keepsake from his past.