The Mysteries of the Longyou Caves

The below article was written by April Holloway for Ancient-origins.net, as reported on by Epoch Time. Additionally, the below video (I believe it is in Mandarin, which unfortunately I cannot speak at the moment, so I am unsure of the comments) shows the scale, scope, and the majesty of the man-made cave system that was only discovered in 1992. Cannot say I know much about this cave, nor can anyone else for that matter, but I present this to you as an enigmatic mystery among many showing how little we know of history.

As reported by Epoch Times and originally present at Ancient-origins.net. The entire article can be found here.

Located near the village of Shiyan Beicun in Zhejiang province, China, lies the Longyou caves – an extensive, magnificent and rare ancient underground world considered in China as ‘the ninth wonder of the ancient world.’ The Longyou grottoes, which are thought to date back at least 2,000 years, represent one of the largest underground excavations of ancient times and are an enduring mystery that have perplexed experts from every discipline that has examined them. Scientists from around the world in the fields of archaeology, architecture, engineering, and geology have absolutely no idea how they were built, by whom, and why.
First discovered in 1992 by a local villager, 36 grottoes have now been discovered covering a massive 30,000 square metres. Carved into solid siltstone, each grotto descends around 30 metres underground and contains stone rooms, bridges, gutters and pools. There are pillars evenly distributed throughout the caves which are supporting the ceiling, and the walls, ceiling and stone columns are uniformly decorated with chisel marks in a series of parallel lines. Only one of the caves has been opened for tourism, chosen because of the stone carvings found inside which depict a horse, fish and bird. The Longyou caves truly are an enigma and here we will explore ten mysteries that are still unexplained despite more than two decades of research.

1. How were they constructed?

A rough estimation of the workload involved in building these five caves is awe-inspiring. The quantity of rock that would have been removed in the overall excavation of the grottoes is estimated to be nearly 1,000,000 cubic meters. Taking into account the average digging rate per day per person, scientists have calculated that it would take 1,000 people working day and night for six years to complete. These calculations are based purely on hard labour, but what they haven’t taken into account is the incredible care and precision of the sculptors, meaning that the actual workload would far surpass the theoretical estimation. As for how they were constructed and what tools were used, it is still unknown. No tools have been found in the area, and, as we will explore later, scientists still don’t know how they achieved such symmetry, precision, and similarity between the different caves.

2. No traces of construction

Despite their size and the effort involved in creating them, so far no trace of their construction or even their existence has been located in the historic record. Although the overall excavation involved almost a million cubic metres of stone, there is no archaeological evidence revealing where that quantity of stone went, and no evidence of the work. Moreover, there is not a single historic document that refers to them, which is highly unusual considering the sheer scale of the project. Their origin is a complete and utter mystery. .......