Qin's pyramid mound is 51 meters (167 feet) in height and its square base has sides of length 305 meters (1000 feet). According to records, it was originally 137 meters (450 feet) tall back when it was constructed circa 210 BCE. The world famous terra cotta warriors are nearby. Legions of these soldiers and horses were buried there to guard Qin after his death.
According to Duan Qingbo of the Shaanxi Institute of Archaelogy, the researchers were not permitted to excavate the tomb. Remote sensing was the only way they had to study its internal structure. They have determined the pyramid-like chamber sits above the tomb's main body which is underground. It has four surrounding stair-like walls with each wall having nine steps of platforms. The researchers believe the purpose of the chamber was to provide an avenue for the emperor's spirit to depart.
This notion coincides with standard Egyptological theory of the purpose of the shafts from the King's and Queen's Chambers in the Great Pyramid of Egypt on the Giza Plateau. Those shafts are thought to be ritual passageways for the soul of the dead pharoah to reach the afterlife.