4,000 years ago, the Egypt of the Pharaohs experienced an unprecedented crisis which has not yet revealed all its secrets. It took nearly a century for the Egyptian kingdom to recover its greatness. The show's teams followed French, English and Egyptian archaeologists who are investigating this little-known transition period. Audran Labrousse and his team enter the tomb of Pharaoh Pepi II, in Saqqarah. His reign, which marked the beginning of the decline of the empire, was among the longest of any pharaoh in history, reportedly lasting 90 years.