The investigations using radar, ultrasound and ERT prove the existence of two air-filled voids underneath the eastern facade, providing initial evidence to support the hypothesis. The work is published in the journal NDT & E International.

For some time now, the structure of the granite blocks on the eastern side of the more than 60-meter-high Menkaure Pyramid has puzzled researchers. The stones are remarkably polished over an area around four meters high and six meters wide. Such smooth stones are otherwise only found at what is currently the only entrance to the pyramid, on the north side. Researcher Stijn van den Hoven hypothesized a possible additional entrance for the first time in 2019.