It originally comprised of six rectangular, flat roofed tombs stacked in decreasing size to a height of 62m. Beneath the pyramid structure is a 6km network of tunnels.

A severe earthquake in 1992 caused significant damage to the pyramid and the burial chamber partially collapsed. As a result the central chamber was also in danger of collapsing. SFK designed a system of careful strengthening using a series of steel anchors leaving the monument safe for future generations.