High above the toxic lower atmosphere, the modular island-harbor of Sunder-Reach drifts within a high-altitude cloud archipelago. Here, Barrett Sterling, a cynical rigger with a heavily damaged leg, works alongside a high-spirited orphan named Kora to maintain the heavy iron anchor cables that keep their town from drifting away. Barrett's brass leg brace and vital harness are powered by a dangerous furnace that slowly burns away his remaining years of life as fuel. Director Vance, a clean-shaven sky magnate who monopolizes high-altitude cloud energy, orders his security forces to systematically sever Sunder-Reach's localized anchor lines under the guise of safety violations, aiming to force the desperate town into a costly, dependency-based energy contract. A sudden, violent thermal shear strikes the archipelago, destabilizing Sunder-Reach and pulling it toward the toxic lower abyss. Instead of offering aid, Vance orders his heavy cruiser, the Aegis-7, to block the main harbor docks to salvage the town's remaining infrastructure once it breaks. Sunder-Reach begins to split. Barrett tries to fire the heavy anchor lines manually, but the mechanical winches are sabotaged, forcing him to directly connect his life-pressurized harness to the volatile crane boiler, escalating the physical cost with every foot of steel cable drawn. In a desperate act of mechanical leverage, Barrett fires a massive harpoon-anchor through the structural keel of the Aegis-7 itself, linking the falling island directly to Vance's pristine cruiser. The corporate crew is forced to reverse thrusters to save themselves, pulling Sunder-Reach back to the stable mainland. Barrett locks the massive brass gear handles into place, securing the town forever just as a brilliant, clean sunrise breaks over the horizon, leaving Vance ruined and Sunder-Reach safe.