Whatever you do, do not use earth-penetrating radar to ping! the Pyramids.
The "ping" is amplified by the Death Caverns, which rings Mother Gaea's chimes, resulting in a major planetary gong-bong (not to be confused with a gang-bang) that leads to the cleaning of Earth's Clock.
It can destroy the World As We Know It!
Zahi Hawass' secret Prime Duty has not to do with archaeology, but rather as a member The Guardians, to prevent this very thing from ever occurring. Archaeology is merely the public front he uses as cover for his real mission.
:’D