Zheng Baobao shook his head: "I haven't been here for a long time, I don't know, you can ask the local people, in this way, you two are resting here, and I will send soldiers to investigate!"

"Be secret!" I instructed.

"Yes, sir!"

After smoking two cigarettes, the matches I brought from Wusi City were almost running out, and the cigarettes were almost gone, and I was hesitating to ask Zhang Xiaomiao to burn some cigarettes for me, Zheng Baobao ran into the inn in a hurry, rushed into my room, and whispered excitedly, "Yes!"

Twenty minutes later, I took only an old man guide and a cavalry captain, and Bingbing, a group of four, dressed in civilian clothes, summoned the catfish spirit from downstream, but did not let it carry us, but let it go to the opposite shore three miles upstream to wait for us.

The four of us rode a small sampan and staggered into the river towards the opposite bank.

The enemy on both flanks found us, but they probably thought that we were the common people who had fled, and there were too few of them, and the rower was still a clumsy old man who symbolically released a few arrows, and then ignored us, mainly because Zheng Baobao also added drama to us, the enemy shot us with arrows, and she also let people shoot us with arrows at the city gate, further convincing the enemy that we were the residents of the city who had fled, not the elaborate work of going out to do things.

Successfully reaching the other side of the river, we hid directly in the forest, walked three miles upstream along the riverbank, and then came to the river, and through the cover of the grass, boarded the back of the big catfish, and let it carry us to the legendary dam site twenty miles upstream.

The old man knew about the dam, and I guess the catfish also knew, and as soon as he told it to go to the upstream dam, the little man in his mouth didn't come out to ask, and he was directly ready to be ridden.

According to the old man, the dam was built 400 years ago, when it rained heavily in the underworld for many years, and the people in the lower reaches of the river suffered without falling, so the Lord of Yama assigned the Ministry of Industry to come to control the water, and after some investigation, the Ministry of Industry decided to take advantage of the mountain to build a dam in this location called "Tiger Leaping Gorge" to regulate the hydrology of the upstream and downstream.

The dam lasted 34 years, has gone through three terms of the Ministry of Works, finally built, after completion, it did play a role in the regulation of flood control and drought control, has long been downstream tens of millions of acres of fertile land, to the underworld for the benefit of the underworld, the Lord of Yama is very happy, personally nominated for the dam, combined with the essence of "Tiger Leap" and "Benefit", called "Tiger Blessing Dam", the old man said that there are still traces of inscription on the dam so far.

"Then how did it go undone?" Bingbing asked.

"It's not deserted, it's still operating normally, but in recent years, there has been endless war in the underworld, and the poor people who were originally responsible for the management of the dam have also been dragged to war, and the dam has no one to manage.

The old man said, it should be the pump room, don't look at the weapons and equipment in the underworld, the construction machinery, it is very powerful, in fact, it does not need much high-tech, as long as you master the steel casting technology and simple mechanical principles, you can manufacture the so-called "organs" of the pump room, assembled, it becomes a valve that can regulate the flood, I have seen it in the reservoir in my hometown before, the structure is still relatively simple, the mechanical principle, junior high school students can understand it.

After leaving the field of vision of the rebels, half of the big catfish completely out of the water, the speed was very fast, like our small speedboat, riding the wind and waves, going upstream, and after a while, I saw that the river in front of me began to narrow, and the plains on both sides also became mountains.

After turning a corner, there is a "big mountain" in front of you, the artificially built "big mountain", up to 100 meters, the mountain is made of huge stones, the whole presents an inward concave structure, it looks a bit like the Hoover Dam in the United States, such an inner arch structure, can better bear the pressure of the upstream river.

"It's so high! How did this thing come about?" Bingbing put his hands on the pergola and looked up.