It Is The Oldest And Most Significant Burial Ground Discovered In Modern Times The Terracotta warriors, horses, chariots, and the emperor's tomb are spread out over a 20+ square-mile compound. One pit (roughly the size of an airplane hanger) contains the soldiers, a second contains the cavalry and infantry units, and a third holds high-ranking officers and chariots to represent the command center. It is believed the tomb was left incomplete, largely due to a fourth, empty pit that wasn't finished even after the emperor died.