'Primitive Machine' Within Great Pyramid of Giza Reconstructed

The ancient Egyptians created a simple yet elaborate system of blocks and grooves within the Great Pyramid of Giza to protect the King's Chamber from tomb robbers. In an upcoming episode of the Science Channel's "Unearthed," that system comes to life via computer animations. In the episode, Egyptologist Mark Lehner describes the system for viewers, calling it a "very primitive machine." Lehner leads Ancient Egypt Research Associates (AERA), a team that has been excavating at Giza for about