Why the tomb of China’s first emperor Qin Shi Huang remains unopened after 2,200 years

In 1974, farmers in Shaanxi Province uncovered fragments of clay that led archaeologists to the Terracotta Army, an estimated 8,000 life-size soldiers arranged in battle formation. Built to guard Qin in the afterlife, according to Geographic magazine, the figures represent only part of a much larger burial complex.

The mausoleum was constructed over roughly 38 years and completed around 208 BC, modeled on Xianyang, the Qin dynasty’s former capital. UNESCO estimates the complex spans about 56.25 square kilometers, an area comparable to a medium-sized city.

Ancient Chinese historian Sima Qian wrote about a century after the emperor’s death that the tomb may contain automatic crossbows and rivers of mercury symbolizing China’s major waterways, as reported by Futura. While long regarded as legend, modern studies suggest parts of these accounts may be accurate.

The Terracotta Army within the China’s first emperor Qin Shi Huang mausoleum complex

A 2020 study published in Nature detected unusually high mercury concentrations in soil near the burial mound. Ground-penetrating radar has also revealed large cavities and complex internal structures consistent with a multi-level chamber.

Archaeologists have excavated sections of the outer mausoleum, including workshops, chariot pits, and the terracotta figures. The central tomb mound, believed to house the emperor’s burial chamber, has never been opened.

Preservation is the primary concern, according to Interesting Engineering. When the Terracotta Army was exposed in the 1970s, its bright pigments faded within minutes after contact with air. Experts fear that opening the tomb could cause similar irreversible damage to artifacts that current conservation technology cannot adequately protect. China’s State Administration of Cultural Heritage follows a strict principle: excavation should not proceed unless preservation can be guaranteed.

Health and environmental risks add another layer of caution. Mercury vapor has already been detected at the surface, and if large quantities exist inside the tomb, excavation could release toxic fumes.

There is also a political dimension. Qin remains central to China’s national narrative as both a unifier and a controversial autocrat. His mausoleum functions as a state monument, and any failed excavation or preservation disaster would carry serious public and political consequences, Interesting Engineering noted.

For now, Chinese authorities and archaeologists have opted for patience, relying on non-invasive technologies to gather information remotely while waiting for preservation methods to advance.