El Lahun

Like the other Twelfth Dynasty pyramids in the Faiyum, the Pyramid of Lahun is made of mudbrick, but here the core of the pyramid consists of a network of stone walls that were infilled by mudbrick. This approach was probably intended to ensure the stability of the brick structure. Unusually, despite a Pyramid Temple on the east side, the entrance to the pyramid is on the south. The archaeologist Flinders Petrie nevertheless spent considerable time searching for it on the east side. He discovered the entrance only when workmen clearing the nearby tombs of the nobles discovered a small tunnel at the bottom of a 40-foot shaft, which led to the royal burial chamber. Evidently the original workmen on the tomb had used their legitimate activity as a cover for digging this tunnel, which enabled them to rob the pyramid. Once he was in the burial chamber, Petrie was able to work backwards to the entrance. ()