Tunnel warfare, long before the Great Zhen Dynasty, was used as a combat tactic.

There are trench type and well type. At the beginning of the Houzhen tribe's horseshoe stepping into the Central Plains, they were met with stubborn resistance, and there were also tunnels in the northern villages with holes and interlaced tunnels.

Tuoyun couldn't bear Yan Fu's disappointment, although he didn't know how she came up with this method of digging tunnels, but based on the visual inspection of the buildings in the adjacent streets, he could probably guess why it was used. This little girl is very precocious, but she doesn't look like a playful person, so she should have prepared a way out for herself.

He comforted Yan Shu and said, "I'm not sure yet, I have an idea that needs to be explored on the spot." ”

Yan Shu said yes, let him command the little guy to do it himself.

Tuoyun let the little guys continue to dig vertically at the original depth. Dig down two feet, and the soil quality has not changed; Dig down another two feet, and it's still the same. Tuoyun didn't give up and ordered to dig some more.

Finally, in a corner of the room, the black clay he had been expecting appeared.

Looking at the smile on Tuoyun's face, Yan Shu's heart lightened, and he asked him with admiration, "How do you know that the soil quality has changed?" ”

Tuoyun pointed to the lake, "I'm just speculating, seeing that there is such a big lake, and the water level does not decrease in winter, I think that it should be able to store water underneath," and he added, "However, I suggest a different place and dig an underground passage further away from the lake." ”

"Is there a more suitable place in this house?" Yan Shu attaches great importance to his suggestion, as long as he doesn't leave this house, it will be easy to do.

Tuoyun said that he would go to the West Cross Courtyard to re-select the spot, and Yan Shu also agreed, so he asked him to find a convenient place to start.

Since there was no need to excavate the entire base surface, but only a small area of depth exploration, six small men and a strong woman went all out, and the results came out after an hour, which was no different from the soil structure of the East Cross Courtyard.

However, this only confirmed that there was a possibility of construction, at least four or five meters underground, and it was not known how it would proceed or what problems would arise along the way.

The only thing Yan Shu can be sure of is that he can't handle it himself.

However, if you entrust this big stall to Tuoyun Gongzi to make decisions and guidance, is it appropriate? It's too much effort and time. She hadn't expected it to be so complicated when she brought him here.

If she stops work and gives up easily, she is unwilling.

Hesitantly, his heart was crossed, but he still opened his mouth, "Childe, I have something to ask for, I wonder if you can help me dig this tunnel?" ”

"Well, I'll try it, I can't guarantee it." Tuoyun is a straight man, without those twists and turns, he can hear Yan Shu's straightforward speech, and he is also happy.

"Thank you! I owe this favor first. The time is up to you, but don't let outsiders know about it, you know. "Yan Shu likes to deal with cheerful people the most, just do it, if it doesn't work, it's not another way, the two sides are neat.

Then he announced in public that in the future, he would ask Tuo Gongzi to teach them construction in person or send someone to teach them, and let him arrange and dispatch everything, and at the same time authorize Tuoyun to enter and leave the Chai Mansion freely, emphasizing that Tuo Gongzi is her friend, and he must be respected and obeyed when the owner is away.

In the kitchen on the other side, Lu Yun told Li Shiyuan that she was Yun Gu who was dressed as a man, and the Yu Gu who came with her was the same as the previous Lu Gu and Honggu, who were all from the young master's house, and taught her not to be surprised. The two of them checked the accounts of the flowers used a few days ago, and gave her five taels of silver for backup, and told her that the logistics support must keep up.

By this time, the sun had set. Winter evenings get dark quickly. Taking advantage of the faint darkness of the night, Tuoyun sent Yan Shu and the three of them back to Yan Mansion with the porcelain they bought today, and then drove back to the residence of the mansion. Along the way, I was thinking about authentic things, and I almost went astray.