suggestions for corrections   Hi Im not a native english speaker so I hesitate to edit some mistakes myself  Whether the sarcophagus was ever intended to house a body is unknown It is too short to accommodate a medium height individual without the bending of the knees a technique not practiced in Egyptian burial and no lid was ever found  I never heard about the sarcophagus being too short this is certainly not generally accepted knowledge Also there are many other presumed items missing such as the portcullis blocks alleged remnants are left some kind of slide connecting gallery and ascending passage entrance blocks and the entire floor of the queens chamber Keep in mind that the pyramid was open for centuries with no guards whatsoeveronly immovable or almost immovable structures remained until the first attempts to a professional description of the interior more than  years after construction  Egyptologists suggest the chamber was intended to be the original burial chamber but that King Khufu later changed his mind and wanted it to be higher up in the pyramid  The change in planstheory has been suggested by some but AFAIK is rejected by contemporary egyptologists such as Lehner and Stadelmann Instead they suggest an intended unfinishedness for religious purposes  The Greeks believed that slave labour was used but modern Egyptologists accept that it was built by many tens of thousands of skilled workers  Not the Greeks but Herodot writes about slaves a myth which seem to be ineradicable He visited the pyramids  years after the construction and beside naming the builders correctly had not much of a clue about anything else  The Great Pyramid is the only pyramid known to contain both ascending and descending passages  Id say the satellite pyramid of the bent pyramid counts too It has a remarkable similarity to the great gallery as well Minor point I know  The National Geographic Society filmed the drilling of a small hole in the southern door only to find another larger door behind it  I know Hawass said that during the show but no other egyptologist believes that Look at the images yourself There have been no further attempts made to open the alleged door Id say dont call it a second door until proven otherwise The shafts seem to end in this tiny rooma very similar structure can be found in the southern upper shafts as well by the way  Joyce Tyldesley states that the Great Pyramid itself is known to have been opened and emptied by the Middle Kingdom  I wonder where Mr Tyldesley got that information from I am not aware of any ancient source regarding the opening of the pyramid While I believe it has happened and during the first intermediate period there is nothing but vague hints in old egyptian sourcesI think the term known is exaggerated Herodot and Diodor claim to have been insidethat points to the pyramid being open around  bc but at which point the opening happened remains uncertain   Hope this is helpful