Khufu, the person who is given the credit for the construction of the Great Pyramid, has a coffin that raises many questions. The sarcophagus weighs around 3.75 tons which are quite heavy. So heavy that scientists believe that it could not have been carried inside the pyramid after it was built. So they think that it was placed there much earlier.
Then there is the part where it is believed that the sarcophagus is carved completely out of granite which as most of you would know is pretty tough to carve. Drill holes have been discovered on the sarcophagus. The question is, what drill was used at that time to carve granite?