With dimensions close to that of the Grand Gallery (a 47 m long x 8 m high architectural structure located at the heart of the Great Pyramid), this new cavity, named ScanPyramids Big Void, has a minimum length of 30 meters. It was observed for the first time using nuclear emulsion films installed in the Queen's Chamber (University of Nagoya team), and was then detected with a scintillator telescope installed in the same chamber (KEK team). This void was confirmed using Micromegas gaseous detectors located outside of the pyramid and at very different angles of view, making it possible to refine its localization.
This is the first time that an instrument has detected a cavity in the deepest part of a pyramid from the outside.