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Because they travelled by horse and carriage the whole way, they travelled quite fast, and it was almost evening when they arrived at the cave.

"This cave goes straight through the mountain. When we were cleaning it up, we found that the inner wall of the cave looked natural, but in fact, it was excavated by the work of nature."

It's just that it's not something a human can do, Xu Da expressed this with his eyes.

After hearing this, Yu Hongdou was very curious and immediately looked into the cave.

The cave is about three meters high and two meters wide. A small carriage can enter, but the entire cave will be filled up once inside, which may pose a safety hazard.

“Such a large project may take ten generations of Yugong to complete it, right?” Yu Hongdou retracted his head and sighed to his brother and Tan Yanlin beside him.

Although Yu Song came along, he just sat in front of the carriage and recited silently. He had to go to Beijing in the spring to give it a try.

Yu Hongdou originally wanted to suggest not letting her brother come, but she knew that he would definitely be worried.

Yu Hongdou decided that after finishing the trip to Cigou Village, she would go back to her village and stay at home for the time being.

Winter is coming soon and the weather is getting colder. After all, Teacher Mo is old, so she should take a break for a while and go to Yunhai County in the spring next year.

"Let's go, go there early and rest early." Yu Song suggested. It was too late and he didn't feel safe even in the cave.

Xu Da said yes and ordered his men to unload the carriage and park it on the right side of the cave, where there were three thatched stables.

The stable was made of simple wooden poles with corn stalks and straw on three sides. It was extremely crude, but could temporarily provide shelter from the wind and rain.

"A carriage is a big item. Most people can't steal it without an animal. And if it is stolen, it will be easily discovered, which is not worth the loss. So it's safer to leave it here." The man next to Xu Da explained.

Xu Da smiled awkwardly and did not mention that the Cao family had put up a sign here, stating that if anyone stole, they would be pursued to the end no matter where they were.

Later, as more people came and went, Yu Erlang from Taoyuan Village asked someone to pass on a message, saying that the deterrent effect was enough and that if it was left on for too long it would appear aggressive. Only then did Xu Da order the signs to be removed.

"That's right. It's convenient for both myself and others." Tan Yanlin thought this was a good idea. When he was traveling outside and encountered wind and rain, he would hope to have a shed on the side of the road to rest.

As they were talking, the carriage had been parked and they all went into the cave.

Apart from a brief visit to a stalactite cave while traveling, Yu Hongdou had never been into a natural cave again.

This trip was a bit like an adventure. I was excited but also a little scared. I felt a little overwhelmed.

“I used to think that deep water is scarier than high mountains because there are too many unknowns underwater. But when I really walked into the mountains, I found that there were just as many secrets in the mountains.” Yu Hongdou sighed in awe of nature.

In front of her was Yu Song, and behind her was Tan Yanlin. When they heard these words, they had different meanings and thoughts.

In fact, Yu Song didn't want his sister to go to the mountains every day. There were many secrets, wealth and dangers in the mountains. After several times, Yu Song was really afraid that his sister would get hurt.

Tan Yanlin's thoughts were completely opposite to Yu Song's. What he heard was the little girl's yearning for the vast sky and sea.

He wanted to say that sooner or later, the sky would be high enough for birds to fly and the sea would be wide enough for fish to swim, and as long as she wanted to go out, she could go up the mountains or down to the sea.

But... Tan Yanlin didn't say that these are all empty talk now.

"It's too early to say that now. We can only make a more accurate comparison when we go back and see the sea in person." Mo Shougui was in front of Yu Song. When he heard his little disciple's sigh, he turned around and spoke again.

The child is still young. Although he has seen more things than others and is smarter than others, he still needs to broaden his horizons.

Only after she has seen the diversity of this world will she understand that neither water nor mountains are as profound and unfathomable as the human heart.

Yu Hongdou smiled. Indeed, although she had seen the sea, she did not have a golden finger in her previous life, let alone the talent of "awakening"!

She really wanted to try out how good the Tanka’s swimming talent was!

"The texture of this stone doesn't feel like it was shoveled, but more like it was formed in one go." Tan Yanlin touched the smooth wall of the cave and looked up and down in the light of the torch.

Yu Hongdou followed him to look. She knew nothing about geology and engineering, but the wall of this cave was indeed too smooth. It felt more artificial than some scenic spots built in later generations.

She turned her head to look at Tan Yanlin, and her eyes met his. They nodded in tacit understanding. Obviously, this was the same as the South Spring Eye and the North Spring Eye, both of which were "immortal techniques."

"Uncle Xu, how long is this cave?" Yu Song already knew about the cave, but this was his first time here.

"It's a distance of four and a half miles. Cao Su has measured it." Xu Da turned around and responded. His voice was a little loud. Miraculously, there was no echo in the cave.

Yu Hongdou listened carefully, but really heard nothing. She looked up again curiously and couldn't help but touch the wall of the cave.

When I touched it, I found that the seemingly smooth stone wall actually contained dark patterns like fish scales.

I think these dark patterns contain some sound-absorbing principles.

A distance of four and a half miles is equivalent to more than two thousand meters. Yu Hongdou's daily running exercise is about this amount, so she didn't feel tired.

Mo Shougui was dragged by his young apprentice to get up early every day to practice boxing and take a walk. His body became much stronger. Although he was a little out of breath, he could still hold on.

What was unexpected was that Xu Da was already carried on his back by the man next to him.

"Uncle Xu's foot was injured when he was young. He has been running around in the mountains these days and his foot is injured again." The man said this to Yu Song and Yu Hongdou as Xu Da waved his hand.

"Uncle Xu, you have worked so hard." Yu Hongdou said sincerely.

Although I don't quite understand why he was so keen on helping the Cao family find Cao Yun and Xu Maoling, Xu Da did help them a lot.

"Why say all this? I did this of my own accord. Not to mention my friendship with the Cao family over the years, I am also very interested in the experiences of the ancestor of the Xu family." Xu Da shook his head. After all, he did this of his own accord.

Yu Hongdou believed this, but only half of it.

She knew that Cigou Village, or the Cao family and Xu Da must be hiding something. The current harmony and beauty were all built on the basis of common interests.

However, Tan Yanlin thought of another thing at an inappropriate time, which is, from which generation did the Cao family start to have golden blood?

If Xu Da's ancestor was Xu Maoling's stepson, where did this child come from, why did he fall into the hands of two grown men and be adopted by two grown men who were obsessed with experiments?