My old man who was a history lecturer at Rhodes university in Gatstad, put me onto questioning who built the pyramids and gave me a book that was very plausible but went way out of left field in terms of the lining up of the shafts with constellations.
They reckon they discovered a piece of timber up one of the shafts using a cable controlled vehicle that had a camera on it but the operation was shut down before they could get a drill up there to take a core sample and carbon date it.
They have since been roundly poohed poohed in circles that receive select artefacts and access.
The following link gives another fascinating look at the possibility that these guys were right and that they built by a global population from another era. I had a look at the slides first and then the interview.
Lots of very compelling evidence!
projectavalon.net/lang/en/klaus_dona_en.html