In 2063, Earth is mostly flooded due to sea levels rising from human activity. Two continents are at war over resources, with a military outpost, The Sentinel, caught in the middle. The crew of four soldiers is stranded after their relief doesn't arrive. Amid a storm, Cassidy and Sullivan successfully fish, but face challenges. Officer Hendrichs orders securing explosives as violent waves threaten the outpost. Baines gets stuck fixing pipelines as the duo loses their catch. The structure survives the massive wave, and the crew plans their next move.