Some researchers believe that these are pipes left by an ancient civilization.

There are dozens of strange tube-like structures inside the caves of Mount Baigong and in the surrounding area, which are the subject of all sorts of conspiracy theories and rumors.
The first mentions of the structures, called Bai Gong pipes, appear to come from Chinese state media, Xinhua News Agency. According to the article, the tubes consisted of "30 percent iron oxide with large amounts of silicon dioxide and calcium oxide," and scientists were unable to identify 8 percent of the tubes' composition.
The intrigue surrounding the fact that 8 percent of the material is unidentified and that it actually looks very similar to pipes has led to incredible speculation among conspiracy theorists. According to various YouTube videos and articles from websites that also post a lot of Bigfoot content, the pipes are evidence of advanced but ancient civilizations or equally ancient aliens.
So what exactly are Baigong pipes?
Well, they do appear to be ancient, as conspiracy theorists would have you believe. But that's because they were likely formed by geological processes.
Mysterious "pipes" found in southern Louisiana are likely fossilized trees, according to geologists who studied them.
"The cylinders are hypothesized to represent taproot casts of fossil trees in which sediment has replaced wood and pedological and diagenetic processes have resulted in the preservation of the external shape of the tree root while the internal structure has been lost," one team explained in 1993 .
Minerals formed around the roots, and then those roots rotted inside, leaving a hollow pipe effect. This explanation has also been given for the Baigong pipes, according to Atlas Obscura, with experiments confirming that the "pipes" themselves contain organic plant matter.
According to another version, these pipes were made by natural casting. According to this theory, the sandstones were left behind by the uplift of the Tibetan Plateau, which were then filled with iron-rich sediments when the area was flooded.
In any case, the origin of these “pipes” can be explained without the “help” of aliens or ancient civilizations.

There are dozens of strange tube-like structures inside the caves of Mount Baigong and in the surrounding area, which are the subject of all sorts of conspiracy theories and rumors.
The first mentions of the structures, called Bai Gong pipes, appear to come from Chinese state media, Xinhua News Agency. According to the article, the tubes consisted of "30 percent iron oxide with large amounts of silicon dioxide and calcium oxide," and scientists were unable to identify 8 percent of the tubes' composition.
The intrigue surrounding the fact that 8 percent of the material is unidentified and that it actually looks very similar to pipes has led to incredible speculation among conspiracy theorists. According to various YouTube videos and articles from websites that also post a lot of Bigfoot content, the pipes are evidence of advanced but ancient civilizations or equally ancient aliens.
So what exactly are Baigong pipes?
Well, they do appear to be ancient, as conspiracy theorists would have you believe. But that's because they were likely formed by geological processes.
Mysterious "pipes" found in southern Louisiana are likely fossilized trees, according to geologists who studied them.
"The cylinders are hypothesized to represent taproot casts of fossil trees in which sediment has replaced wood and pedological and diagenetic processes have resulted in the preservation of the external shape of the tree root while the internal structure has been lost," one team explained in 1993 .
Minerals formed around the roots, and then those roots rotted inside, leaving a hollow pipe effect. This explanation has also been given for the Baigong pipes, according to Atlas Obscura, with experiments confirming that the "pipes" themselves contain organic plant matter.
According to another version, these pipes were made by natural casting. According to this theory, the sandstones were left behind by the uplift of the Tibetan Plateau, which were then filled with iron-rich sediments when the area was flooded.
In any case, the origin of these “pipes” can be explained without the “help” of aliens or ancient civilizations.