D-100: The Acadia Contingency

As news of an extinction-level asteroid impact sends New York City into a chaotic death spiral, construction supervisor Ethan Miller makes a pact with his sister, Chloe, a student trapped at Yale: survive until he arrives, then escape to their family's refuge in Maine. Armed with construction tools and makeshift armor, Ethan fights his way out of a blockaded Brooklyn. He reaches a besieged Yale, executing a daring rescue for Chloe from the university's fortress-like library. They team up with Marcus, a mechanic who transforms Ethan's truck into an armored snowplow. Their journey north on I-95 is a desperate gauntlet of abandoned vehicles, scavengers, and a brutal New England winter. Arriving at Acadia National Park, they find the designated elite fallout shelter, 'Bunker Sentinel,' has been seized by ruthless Aegis mercenaries who are enslaving refugees. Using his engineering skills, Ethan orchestrates an internal revolt, seizing control of the bunker. In the final days, they must defend their new sanctuary from vengeful mercenaries and desperate hordes. On D-DAY, as asteroid fragments light up the sky, Ethan seals the blast doors just as a colossal tsunami generated by the Atlantic impact bears down on them.