In the great pyramid

The Cheops Pyramid in Egypt is one of the seven wonders of antiquity. The pyramid is located in the sesert near Cairo next to two smaller pyramids of King Chefren and King Mykérinus. Outside the Sphinx watches the mysteries of the Pharaoes, as it has done since the pyramids were built 4,500 years ago...
The Calif Al Mammoun was the first man to open the great Pyramid - eleven hundred years ago. At that time the original main entrance was hidden behind great stone blocks. He finally gets on to rooms which are hardly accessible where nobody has been for more than 100 years. But all the chambers are empty. According to the theory of the Danish architect, Hubert Paulsen, about the geometrical principle of the pyramid there must be another room, Is this the burial chamber of King Cheops?