I want to point your attention to an interesting article that I read recently in my research by Ralph Ellis and Mark Foster called Tunnel Vision.
What they are wondering about is what is known as Al Manun’s forced entry tunnel, the one tourists today use to enter the Great Pyramid as opposed to the original entrance that is a bit further up the pyramid. I had long wondered if the story (that he just randomly began digging a tunnel when he could not find the original entrance) was just wrong. That is because his tunnel is almost at the exact point where the descending passage and the ascending passage meet.
This article goes into detail on the background, and gives a possible interesting reason for its being dug. I don’t want to say I agree with everything, but it does provide very thought provoking ideas that all who study the Pyramid should ponder.
A simple version of the article is here
Another version with a few more photos is here