TWO amateur French archeologists aroused the envy of their peers Thursday after finding rooms and corridors in a 4600 year-old Egyptian pyramid that give new clues to pyramid building techniques. Jean-Yves Verd’hurt, a 60-year-old real estate manager, and Gilles Dormion, 55, a draftsman in an architect’s office, said they found rooms with stepped walls inside Maydum pyramid, 80km south of Cairo. The pair used a surgical-type endoscope, a flexible tube with a camera on the end, to penetrate the walls of the pyramid. Until now only the Great Pyramid of Cheops, which is 4500 years old, had been known to contain such rooms aimed at easing the stress of the pyramid’s weight on rooms and passages underneath.