In the year 2063, Earth has been mostly submerged by rising sea levels, leaving only two small continents in constant conflict with each other. On one of these continents, Last Sentinel's crew, led by Hendrichs, is stationed in a watchtower, armed and waiting for the next attack. Relief was supposed to arrive three months ago, but it has yet to show up. When an empty ship, the Aurora, drifts into view, the commander decides to use its supplies to continue their wait, but the crew is divided on whether to repair the ship and attempt to sail home or stay put. Sullivan and Baines want to escape, while Hendrichs insists on staying put and arming the watchtower's weapons. As tensions rise, a passing ship raises suspicions and Sullivan is sent to investigate, but Hendrichs is quick to consider it a threat and willing to blow it up without hesitation. Amid the chaos, it becomes unclear if the outpost is adrift and if the crew knows where they truly are. Will their fear and mistrust lead to their downfall? Only time will tell.