Are there more chambers in the Great Pyramid?

Two secret chambers that are housing funeral furniture has been discovered at the Great Pyramid of Giza. The furnitures would have been intended for use in the afterlife by the pharaoh Khufu, even known as Cheops.

I am convinced there are antechambers in this pyramid. What I want is to find them

Says Jean-Pierre Houdin a French architect. Who in 2007 advanced the theory that the Great Pyramid was built inside out using an internal spiral ramp. The most belive theory has been that the pyramids where built by a outside ramp.