Unseen Markings in Great Pyramid

A robot travelling up the so-called air shaft of the great pyramid has found red builders' markings behind a door with metal pins in it in the shaft. The robot was built by engineer Rob Richardson from the University of Leeds as part of the Djedi project, with Dr. Zahi Hawass, Egypt's minister of state for antiquities affairs, as the director of the project.

The pyramid was built for the Old Kingdom king Khufu about 2600bc probably as his tomb. Project Djedi is named after a magician whom King Khufu consulted on the building of his tomb.