The party’s return to the ESS Albacore was met not with the professional silence of a submersible, but with the chaotic echoes of a vessel in the throes of a violent coup. They discovered the mangled remains of Officer Arthur Langdon, who had been brutally murdered by the mutineers during the party's absence. First Officer Drax Trulia had seized the arcane control switch, effectively enslaving the ship’s warforged security force to his will. The submersible became a claustrophobic dungeon as the party navigated through flooding corridors and flickering lights, engaging in desperate skirmishes against their former crewmates. During the initial push to retake the ship, the loyal helmsman Warrick Drutha was killed in a frantic exchange of fire, further thinning the ranks of those loyal to the Captain.

As the party moved deeper into the hull, they were forced to corner and eliminate the primary instigators of the mutiny. The sailor Nicola Cornelius and the engineer Hothud Copperhood were both slain in a series of brutal, close-quarters confrontations as the party fought to reach the captive Captain Carver. Amidst the fighting, the party discovered a profound secret regarding the vessel's construction: the Albacore was equipped with a unique sentient enchantment, a mimicry of Carver’s daughter currently living in Ireland. This artificial soul made the ship uniquely responsive to Carver’s voice, explaining why the mutineers had captured the Captain rather than executing him immediately.

The mutiny reached its violent climax on the bridge and in the engine rooms. In a final, desperate battle against Drax Trulia and Sampson Hornblower, the high-pressure environment of the deep sea became an active combatant. Gunfire and magical discharges punctured the pressure-stressed hull, causing freezing seawater to erupt into the ship. Trulia, realizing his defeat was imminent, fatally sabotaged the vessel's primary systems before he was finally brought down. Captain Carver was mortally wounded during the exchange, leaving the survivors with minutes to escape before the ship's total structural failure.

In a final act of reclaimed autonomy, the remaining Atlantean warforged sentinels—Boss, Boo, Bolo, Bobo, and BB—made a collective decision to sacrifice themselves. Utilizing their mechanical frames to block ruptures and hold back the encroaching weight of the ocean, they bought the party, Miyake Harrier, and the eccentric Zachary Harrow enough time to reach the Captain’s yacht, a smaller submersible attached to the Albacore's belly.

As the yacht detached and accelerated away from the doomed vessel, the party watched through the viewports as the ESS Albacore imploded under the crushing weight of the Sea of Ghosts. The journey toward the Europan coastline was defined by a heavy, somber silence. During the transit, Captain Isaac Carver succumbed to his wounds. In his final moments, he extracted a solemn promise from Muddy Mittens to deliver the ship’s Shardisite Core—the anchor for the ship's sentient personality—to his family in Ireland, so they might know the story of his sacrifice and the loss of his vessel.