FIG. 2
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A hidden corridor inside Khufu’s Great Pyramid photographed by an endoscope.
The existence of the corridor was first discovered using muography (Nat. Commun. 2023; 14:1144) and confirmed by an independent team using GPR and ultrasonic testing (NDT E Int. 2023; 139, 102809). Photo: Egyptian Ministry of Tourism and Antiquities.
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