There is no indication, no clues and no data to say there is anything significant hidden inside the Giza Pyramid of Khafre.

But that doesn’t mean we should stop looking for hidden passages and chambers, because in the 1970s, California-based SRI International, previously known as the Stanford Research Institute, conducted acoustic soundings through the floor of the Belzoni Chamber, and interestingly, they did find something.

At a depth of 21 metres or 69 feet and then again at 33 metres or 108 feet, the returning echoes indicated there were two large anomalies. Watch this video to learn more and if they are in fact man-made, experts may even know where to look to find a way inside.