Quick Facts: Location: Shiyan Beicun village, Longyou County, Zhejiang Province, China | Date/Year: Carved over 2,000 years ago; rediscovered 1992 | Status: Unsolved | Scale: 24 chambers catalogued at first, over 30,000 square metres in total
In 1992, a handful of villagers in eastern China ran a water pump for 17 days to empty a pond that local legend said had no bottom. When the water finally dropped, they found a stone doorway under the surface. Behind it was a hall with a ceiling as high as a cathedral's, and not one written record explained who had cut it.
The Pond Nobody Trusted
Shiyan Beicun sits near Fenghuang Hill, in the countryside of Quzhou. The village had a cluster of ponds, and the old stories said they were bottomless. People accepted that the way you accept most things you grew up hearing.
One villager didn't. English-language accounts usually give his name as Wu Anai, though sources disagree on the details. Some say four farmers did the pumping, others say five. He thought the ponds were too neat and too deep for natural ones. He talked neighbors into buying a pump, and they spent more than two weeks draining the first pond.
Under the water, they found an opening cut into solid sandstone. The sides were too straight and the floor too level to be natural. Inside was a chamber the size of a small airport hangar.
Over the following years, researchers and local authorities pumped out more ponds. The count of chambers grew from a handful to 24, and more recent tallies go as high as 36. The numbers vary because some of the caves are still partly flooded or unexcavated.
What's Actually Down There
The five largest chambers are enormous. Each is roughly 18 to 34 metres across, with ceilings between 20 and 30 metres high, depending on the cave. Their floors average around 1,000 square metres each. Thick stone pillars, left standing as the rock around them was removed, hold up the roofs. Some caves have staircases cut straight into the stone, and some have carved figures on the walls, including animals.
Then there are the walls themselves. Almost every surface, from floor to ceiling, is covered in parallel chisel marks. The lines are strikingly regular, with an error margin of no more than about half a centimetre in places. Whoever cut them worked by hand and kept their rhythm for hundreds of thousands of strokes. A few caves have deeper, rougher marks on the north wall, but the overall pattern is consistent from cave to cave.
Estimates of the rock removed run to nearly a million cubic metres. That's roughly 400 Olympic swimming pools of stone. Chisels of several sizes turned up in one of the large caves, so archaeologists think the carving went from the top down, with workers shaping the ceiling first and working downward.
Did You Know? Each cave has only one entrance. And in the floor of several chambers, researchers found a water collection system, a small channel built to gather moisture. The caves also face a direction that lets in the most sunlight. Someone planned how these rooms would breathe, drain, and catch light, yet nobody has found a single sentence about them in any surviving Chinese text.
The Silence in the Records
China has one of the longest written histories on Earth. Dynasties kept annals, local gazetteers tracked county affairs, and officials logged everything from harvests to floods. Yet nothing in the records of the region mentions a project that removed a million cubic metres of rock.
The only literary trace is a poem by Yu Xun, written in the 17th century. It doesn't say who built the caves. It does show that someone knew they existed long after they'd supposedly been forgotten. Scholars have mined it for clues, but it raises more questions than it settles.
Dating is the next problem. Sandstone doesn't hold carbon, and nobody can radiocarbon-date a chisel stroke. Researchers have relied on the carving styles and tool marks instead. Most of them place the work somewhere between the Spring and Autumn Period (770–476 BCE) and the Western Han dynasty (202 BCE–8 CE). That's a window of roughly 800 years.
There are other oddities. The caves show almost no signs of people living in them, with no hearths or soot-blackened ceilings. And if the stone was hauled out, no one has located the dump, a pile that would have been hard to miss.
So Who Built Them?
The military theory. Some researchers point to the kingdom of Yue, which ruled this region. After King Goujian of Yue was defeated by Wu around 494 BCE, the story goes, he spent years rebuilding his strength before finally destroying his rival in 473 BCE. Longyou lay deep inside Yue territory, far from Wu. A hidden underground complex could have served as a training ground or a secret base. The scale fits a state-run project, though no document ties Yue to these caves.
The quarry theory. The simplest explanation is that the caves were quarries. Sandstone was useful for building, and cutting pillars to hold the ceiling up is how miners work. But quarries tend to be rough. These caves are symmetrical, decorated, and carefully drained. Nobody carves a staircase and a carved animal into a hole they plan to abandon.
The royal burial or palace theory. A third idea says the chambers served as tombs, granaries, or royal storage. A burial complex would explain the scale and the planning, but nobody has found a body, a coffin, or grave goods in any of the caves.
The ritual theory. Others suggest a religious site. Fenghuang Hill, whose name means "Phoenix Hill," may have been considered auspicious, and the caves could have served ceremonial purposes. This idea is hard to test because ceremonies leave little behind. It's the same kind of puzzle that surrounds the underground cities of Derinkuyu in Turkey, where scale and design suggest purpose but no inscription confirms it.
Each theory explains some features and fails on others. The caves' sheer scale suggests a powerful state. Their absence from history suggests secrecy, or a collapse so complete that even the memory vanished.
Where Things Stand Today
One of the caves, chosen because it's the most ornately carved, is now open to tourists, and the surrounding area has become a visitor site. Chinese media have called the complex "the ninth wonder of the ancient world," a title nobody outside the tourism board formally recognizes.
Research continues, but slowly. Draining and stabilizing flooded caves is expensive. Opening more of them risks the fragile sandstone. Many chambers remain closed, and a good portion of the complex hasn't been studied in detail.
More than three decades after the pump went on, the key questions are still open. Nobody can say who dug them, when exactly, or why. The caves keep their secrets, and every explanation so far leaves something unaccounted for.
FAQ
How old are the Longyou Caves?
Most estimates put them between 2,000 and 2,800 years old, from the Spring and Autumn Period to the Western Han dynasty. No exact date has been confirmed.
Who discovered the Longyou Caves?
Local villagers did in 1992, after pumping water out of a pond for about 17 days. The man usually credited with leading the effort is Wu Anai, though accounts differ on the details.
Are the Longyou Caves open to visitors?
Yes, but only one cave, the most elaborately carved, is open to tourists. Most of the others remain closed for preservation and safety.
Closing Thought
If a million cubic metres of stone could vanish from history, what else might be sitting under a quiet pond somewhere, waiting for someone stubborn enough to ask whether the water is really that deep?
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