The researchers, who represent a collective known as the ScanPyramids project, published their findings in the journal Nature on Thursday. In the report, the team reveals it discovered a mysterious empty chamber roughly halfway up and deep inside the structure by using a special next-level X-ray-esque technique involving cosmic ray collisions. It's a more significant and much larger void than one they discovered behind the pyramid's north face last year, according to a report in The New York Times.
The hidden empty space, which they're officially calling the "ScanPyramids Big Void," measures roughly 98ft long and 50ft high. Since no one has been inside to peek around yet, it's entirely unclear what purpose the chamber may have served, but experts are scrambling to pose their own theories. “We don’t know if it’s a chamber, a tunnel, a big gallery or things like that,” ScanPyramids co-director Mehdi Tayoubi told the Times.
Others are hesitant to declare it such a groundbreaking discovery, skeptical that the void is merely an intentional architectural element necessary to maintain the pyramid's structural integrity. One Egyptologist in particular, Mark Lehner, is thoroughly unmoved.
"The great pyramid of Khufu is more Swiss cheese than cheddar,” he said, per the paper. "At that angle, it doesn’t make much sense for it to be a chamber that would contain artifacts, burials and objects and that sort of thing."