This underwater passage is not spacious, only less than one meter and five meters wide, only two people can walk side by side, it is not too high, and it is only two meters high, so it makes people feel suffocated and oppressed when they walk in. In order to prevent the presence of aggressive creatures inside, Hu Zhibo took the lead and sneaked inside to inspect the situation. Luckily, there were no creatures in the passage, only mossy moss on the slippery stone walls.

The procession then rushed in. Gu Fengchun walked at the front of the team this time, and he found that the passage here was slightly raised forward, presumably the terrain here must have left the water at the end. There should be a place full of air.

Thinking of this, Gu Fengchun breathed a sigh of relief in his heart. The oxygen on everyone's masks had already been almost consumed. Relying solely on the oxygen in it, I'm afraid it won't last long. So he immediately made the crowd move faster.

"Feng Chun, look at this stone wall." Xiao Zhonghua accidentally rubbed off a thick piece of algae, and found that there was something else under the algae cover. So he conveyed his discovery to Gu Fengchun through the communicator.

Gu Fengchun quickly swam to Xiao Zhonghua's side.

What Xiao Zhonghua found was a mural painting. Some of the lines outline some of the figures on the walls. But the part that shows is still very small. Gu Fengchun pulled out the thorn and slowly scraped it on the wall. Seeing this, everyone also took out utensils to help scrape the walls, and after a while, the moss on the walls on both sides was peeled off, revealing a magnificent picture.

The lines of the mural are delicate, but they are also simple. It's just a mural sketched with the simplest lines, but it doesn't hurt the shock of the ancient style.

It's a narrative mural, and it's very long. The crowd only scraped the moss from the section they swam through, and the part inside was still hidden in the seaweed moss. Gu Fengchun motioned for everyone not to stop, and continued to blow inside, while he himself walked back, wanting to look all the way from the entrance and take a closer look.

Luo Xiaodan knew Gu Fengchun's intentions, but he didn't worry about him alone, so he also went with him.

There are murals on both sides of the walls. Fortunately, the murals on both sides do not tell the same story. And Gu Fengchun felt that the age of these two murals was not consistent, and the time was very far apart. The fresco on the left is noticeably much rougher than the one on the right.

Inside the mural on the left, there is a huge mine where people are mining and smelting. Gu Fengchun was surprised to see some familiar tools from the pictures of these mines. That's all mining trucks! In addition to mining vehicles, there is a lot of mechanized equipment. It's just that the mural is relatively simple, and Gu Fengchun can't see what it is at all. Gu Fengchun trembled, and he couldn't speak. How could such a thing be in this mural? Gu Fengchun's brain is a little cloudy.

But that's not the point, in the mural, in addition to mining, there are also smelting factories, and there are also smelted items: copper pillars! Bronze Pillars! These bronze pillars have been seen by Gu Fengchun, and these bronze pillars stand in the entrance of the temple. Judging from these proportions, the actual length of this bronze pillar is probably no less than 500 meters. The part I saw was only a small part of what was exposed on the surface.

Gu Fengchun soon discovered that after the murals reached these bronze columns, the picture became different. Because Gu Fengchun saw that these bronze pillars were actually transported by manpower and animal power! Is it possible to use manpower to transport finished products in an era when mining is already mechanized? Gu Fengchun shook his head, unsure of what was going on. But when he compared the murals before and after, he found that there was another mystery inside. Just when the picture of the manual transport was compared with the previous one, everything had changed except for the bronze columns. The factories and equipment behind the bronze pillars were all in ruins.

Gu Fengchun seemed to understand something at once. The mural depicts a civilization that predates the emergence of human civilization today. When Gu Fengchun communicated with the mysterious female voice in the forbidden land, he got a positive answer. Before the advent of humans, there were several advanced civilizations that resembled humans that were once destroyed by prehistoric humans. And the female voice also said that some civilizations are even more advanced than the current human civilization.

Gu Fengchun looked eagerly all the way, wondering what happened during this period. However, he was disappointed that nothing of value was found in these murals. However, he counted a few different changes. These changes are: the background of the mural has been changed a total of six times, and these pictures are transformed between the mechanical ability of a high civilization and the physical strength of a low civilization from the smelting of copper pillars to transportation, to construction, and to completion.

What does this mean? Gu Fengchun's mind spun quickly, and he quickly came to a conclusion. That's the temple, which went through different civilizations and took a very long time to build. During the construction of this temple, it underwent a total of three transformations between higher civilizations and three lower civilizations before it was finally completed.

In Gu Fengchun's cognition, it was the Wu people who built this temple under the guidance of prehistoric humans! But this discovery is enough to prove that his previous perception was wrong, perhaps not entirely correct. It is likely that the Wicans were involved in the construction of the temple, but they were only part of the temple. And Gu Fengchun is not clear, which part of the Wu people are involved, is it the high-end period of civilization development, or the low-tide time?

There is another thing that Gu Fengchun doesn't understand. Why is this temple still being built during the change of civilizations? Why didn't prehistoric humans let one of the civilizations build this temple before killing it?

Gu Fengchun felt that his brain was very messy. He couldn't help but sigh again, thinking, "If only Chen Si was sober." But Chen Si was still asleep.

Gu Fengchun didn't have a clue, and then went to see the murals on the other side. On the other side, there are not many murals, but more carved symbols. But these inscriptions Gu Fengchun can't understand, because this is the text of the merman. Gu Fengchun thought it was very strange, why did the merman's words appear in this place. In particular, the writing of the mermaids is still in a very backward state.

"Shark King, come here and help me translate these words." Chen Si gestured to the merman to come over. Gu Fengchun said secretly in his heart: "Perhaps, the answer is here." ”