66 Million Years Ago: The Final 24 Hours of the Dinosaurs | Full Documentary

The sky was perfect. Across the shallow seas of what would one day be called the Gulf of Mexico, morning light filtered through coastal mists, illuminating a world that had thrived for 165 million years. Tyrannosaurus rex tracks pressed deep into riverbank mud. Triceratops herds moved slowly across flowering plains. Pterosaurs with wingspans wider than small planes glided on thermal currents, their shadows racing across waters teeming with mosasaurs and ancient sharks. The Cretaceous world was not dying—it was thriving, evolving, expanding into every corner of land, sea, and sky. Nothing suggested that within twenty-four hours, this entire empire would collapse into ash and darkness.