An army of 8,000 clay soldiers still guards an unopened Chinese emperor’s tomb

Beneath the farmland outside Xi’an, in China’s Shaanxi province, an estimated 8,000 life-sized clay soldiers stand in ordered ranks, weapons ready, facing east. They were buried more than two thousand years ago to guard Qin Shi Huang, the first emperor of a unified China, in the afterlife. The soldiers are famous the world over, but the object they protect, the emperor’s actual burial chamber under a nearby earthen mound, has never been opened, and much of what it contains remains a matter of ancient testimony and cautious modern measurement rather than direct observation.

An underground army facing east

The terracotta figures are not a single mass but a structured force, laid out in pits as a real army would deploy for battle. Alongside the infantry stand rows of chariots and horses, roughly 130 chariots, more than 500 draft and cavalry horses, and columns of archers, spearmen, and officers arranged by rank. No two soldiers are quite alike: the sculptors varied faces, hairstyles, armor, and posture so that the crowd reads as individuals rather than copies. When they were made, the figures were brightly painted and many held genuine bronze weapons, though most of the pigment has flaked away in the centuries since and the wooden shafts of their arms have long rotted.

The well diggers who found them in 1974

The army stayed hidden until the spring of 1974, when a group of farmers digging a well in a drought-stricken stretch of Shaanxi struck fragments of a clay figure instead of water. What began as an accidental find turned into one of the largest archaeological projects of the twentieth century, as excavations near Mount Li revealed pit after pit of buried soldiers. Formal digging exposed thousands of figures, and work has continued at the site for decades, with archaeologists still piecing shattered warriors back together from the fragments left when the pits’ wooden roofs collapsed and crushed the ranks below.

The emperor who ordered the whole project

Qin Shi Huang came to power as the king of the state of Qin and, in 221 B.C., completed the conquests that fused warring kingdoms into a single empire, taking a new title that marked him as its first emperor. His reign standardized writing, currency, and measurement across the new state and set in motion vast public works. According to the historical accounts of the mausoleum, construction of his tomb complex was said to have drawn on the labor of hundreds of thousands of workers over decades. The terracotta army was one part of a far larger funerary landscape designed to carry the emperor’s power and household with him into death. He died in 210 B.C., and the empire he built did not long outlast him.

The sealed mound and its rivers of mercury

The soldiers guard the approach, but the emperor himself is thought to lie inside a chamber beneath a large earthen pyramid a short distance away, a mound that archaeologists have surveyed but never dug into. The reticence is deliberate. An ancient chronicle written by the historian Sima Qian roughly a century after the emperor’s death describes an underground palace with a ceiling mapped as the night sky and rivers and seas of flowing mercury representing the empire’s waterways. That account long read as legend, but modern soil surveys around the mound have detected unusually high concentrations of mercury in the ground above the tomb, a pattern consistent with a large quantity of the metal sealed below. With no proven way to excavate the chamber without destroying whatever fragile contents survive, authorities have left it closed.

A World Heritage site still being uncovered

The mausoleum and its terracotta army were added to the UNESCO World Heritage List in 1987, recognized as a monument of exceptional scale and craftsmanship even though its central tomb remains unexcavated. The pits that have been opened are now housed under protective museum halls, where visitors look down on the ranks from walkways, and conservation science has become as much a part of the site’s story as archaeology. Researchers know that the original paint on newly exposed figures can begin to curl and fade within minutes of contact with dry air, a fragility that reinforces the case for patience. For now the clay soldiers keep their watch, and the emperor’s tomb stays sealed, a deliberate gap in the record that later generations may yet be equipped to fill.

That restraint preserves more than spectacular objects. A sealed chamber can retain the original positions of textiles, lacquer, wood, food offerings and written material that would deteriorate rapidly after exposure. Excavation would also remove every layer permanently, so a poorly timed opening could answer a few questions while erasing many more. Archaeologists can instead map the mound with remote sensing, study the surrounding pits and improve methods for stabilizing paint and organic material. The unexcavated center is therefore not an overlooked task; it is a protected archive whose value depends on leaving its physical relationships intact until conservation can match the scale and complexity of the discovery.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

More from Morning Overview