my understanding is that as Alexander the Great swept across asia and europe, he collected all the 'knowledge of the ancients'. This was all collected together in the great library at alexandria. As the city fell, it was all moved to the Hall of Records - somewhere in egypt. It is this Hall that is reputed to under the sphinx. If so, the information would provide details on how the pyramids were built, if atlantis did exist (ie is really antarctica), and provide information used by the mayans, incas and aztecs that was way ahead of their times. Lets hope it is there and they can give us the solution to making beleivable toupees (amongst other things).