Graham Hancock presents evidence for a sophisticated lost civilization erased 12,800 years ago by cosmic catastrophe, arguing the Great Pyramid encodes astronomical knowledge humans shouldn't possess for millennia—and why mainstream archaeology refuses to investigate. The bestselling author behind Netflix's Ancient Apocalypse shares his life's work before heart surgery, revealing how psychedelics transformed his understanding of consciousness and humanity's cyclical rise and fall. The Great Pyramid encodes Earth's polar radius and equatorial circumference using a mathematical scale (1 to 43,200) derived from precession of the equinoxes, suggesting knowledge inherited from an advanced civilization 4,500 years before it should have existed.