What is the secret of the pyramids in ancient Egypt?

Many works have been written about the Egyptian pyramids and it seems that all their secrets are open. But with technological progress, new opportunities appear for a deeper study of the monuments of Ancient Egypt. Modern discoveries of the secrets of tombs and pyramids raise new questions. Antiquity is reluctant to disclose its secrets, and sometimes it takes revenge on those who are determined to open the long-closed doors of the history of ancient Egypt. Currently, scientists are debating what the pyramids were built from and what methods were used in the construction. And, are the pyramids really the tombs of the pharaohs or are they built for something else.