Back in 1993, the crawler robot Upuaut 2 made an interesting discovery - an empty space behind a small door located in the southern shaft of the pyramid. Some years later, in 2010, the modernized robot Djedi managed to take photos from beyond the first door that had copper handles and red ocher paintings. The curious thing to be mentioned here is that even though no one entered the shaft for almost ten years, there were new scratches on the walls and ceiling.
A less know fact is that the Inventory Stela which was found in Giza in the 19th century actually said that the Sphinx was ordered to be restored, and not built. This fact and the furrows which result from erosion that takes 8,000 years, made scientists doubt the real age of the Great Pyramid. So, is the Sphinx a younger monument or a very old one?
In 2016 a thermographic infrared research was made on the Great Pyramid and it showed inexplicable hollows underneath it and others close to the top. May be the lower hollows are unfound chambers or an underground passage? Who knows?
According to the chemist Joseph Davidovits, the blocks are organized on top of each another, which explains their weight and lack of gaps. The paleontologists and geologists say that the blocks are processed sedimentary rocks. There is no unified hypothesis yet.
Back in 1922, when Howard Carter was leading an expedition studying the tomb, he found a plaque with text for a serious punishment that would follow opening the sealed tomb. Carter didn’t believe it that but by 1930, 22 people have died from those that were present when the tomb was opened, and also their family members.
There is no explanation for that curse, though there is a theory that the walls of the tomb and the sarcophagus were covered with poison.