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in the 9th century, the great pyramid still had its facing stone. stones in place. but there were an Arab caliph, Al-Mamun, who had already realized that other pyramids did have entrances. nobody knew where the entrance to the great pyramid was. so he put together a team of workers and they went in with sledgehammers and they started smashing where he thought would be the entrance and they cut their way in, into the great pyramid, uh, for a distance of maybe 100 feet. and then the hammering that they did, did something, dislodge something. they heard a little further away, something big falling. and was there a cavity there? and they started heading in that direction and joined the internal passage ways of the great pyramid. the descending and ascending corridors that go up. when you go up the ascending every one of the internal passageways in the great pyramid that people can walk in, slopes at an angle of 26 degrees. that's interesting because the angle of the exterior pyramid is 51 degrees.