The most stunning and convincing artifacts that clearly contradict theories about how hard igneous rock was quarried and worked in prehistory ancient Egypt are the incredible granite and basalt boxes in the rock tunnels of the Serapeum at Saqqara. Within these mysterious tunnels that were carved out of the limestone bedrock are over 20 huge granite boxes. These 70 ton boxes with their 20 ton lids were quarried at Aswan over 500 miles away and installed in arched crypts recessed into the walls of the labyrinth of underground tunnels. All of the boxes were finished on the inside and the bottom side of the lid, but not all were finished on the outside. It appears that work stopped suddenly in the Serapeum, for there were boxes in several stages of completion: boxes with lids, boxes that had yet to have the lids placed on them, and the rough box and lid near the entrance. The floor of each crypt was several feet lower than the tunnel floor.
Christoper Dunn ….The artifacts I have measured in Egypt have the marks of careful and remarkable manufacturing methods. They are unmistakable and irrefutable in their precision but origin or intent will always be open to speculation. A series of photographs were taken inside the Serapeum . Those taken inside one of these huge boxes show am inspection of the squareness between a 27 ton lid and the inside surface of the granite box on which it sits. The precision square used was calibrated to .00005 inch (that is 5/100,000 of an inch) using a Jones & Lamson comparitor.