Qin Shi Huang unified China’s warring states in 221 BC, proclaimed himself First Emperor, standardised script, currency, and axle-widths — and spent his final years consuming mercury-laced elixirs of immortality that likely helped kill him, at 49, in 210 BC.
His tomb had been under construction since he took his first throne as a boy. The historian Sima Qian, writing about a century later, describes the project: 700,000 conscripts; a burial chamber beneath a mounded hill at Mount Li; palaces and towers in miniature; crossbows rigged to fire on intruders; the ceiling set with pearls as constellations; and across the floor, a model of the empire with its hundred rivers and the seas rendered in flowing mercury, driven by machinery. Craftsmen who knew the tomb’s secrets, he adds, were sealed inside it.
For centuries this read as legend.
29 March 1974
Farmers digging a well near Lintong, about 1.5 km east of the mound, struck fragments of terracotta. Archaeologists who followed uncovered Pit 1 of the terracotta army: rank upon rank of life-sized soldiers — eventually an estimated 8,000 figures with horses and chariots across three pits — each with individualised faces, originally brightly painted and armed with real bronze weapons, arrayed to guard the emperor’s eastern approach.
The find became one of the century’s defining excavations. It also made the point that Sima Qian, if anything, had undersold the mausoleum: the necropolis complex has since yielded bronze chariots of astonishing craftsmanship, terracotta acrobats and musicians, armour of stone plates, and pits of real horse skeletons — a buried administration for the afterlife spread across some 56 square kilometres.
The sealed chamber
The burial mound itself has never been excavated. Remote sensing indicates a large intact chamber within a buried wall circuit, and soil surveys across the mound have found mercury concentrations far above background — strongest in a pattern some researchers argue loosely maps China’s actual rivers, exactly where Sima Qian put them.
The official reason for not digging is conservation, and it is a good one: the terracotta figures’ paint famously flaked within minutes of exposure in early excavations, and no one can guarantee better for whatever two millennia of sealed chemistry — possibly including mercury vapour — waits in the chamber. Chinese policy for decades has been to leave it until technology can preserve what it finds.
So the tomb sits as archaeology’s most famous known unknown: precisely located, described in detail by a historian two thousand years ago, partially confirmed by chemistry — and deliberately unopened.