There is no connection between the 'Folk Road' and the 'Soldier Road', which are separated by only one wall.

"Really?" Xiao Yuanba was suspicious, "How inconvenient this is." ”

"If you open the door on the wall, even if it's locked, if you can't keep it, someone who will pick the lock will sneak here, or even climb into the spotlight pool overhead." I guessed, "I guess to avoid this kind of trouble, the tunnel was built without opening the wall." ”

"Isn't that right?" Xiao Yuanba coaxed, "Colorful sword light, colorful sword light." ”

"There is no door, but maybe it will ...... There is something else. "I walked along, my arms free, tapping against the cold, hard rock wall.

"Ah, I see, this is looking for a weak spot in the stone wall?" Xiao Yuan is domineering.

"You're not mistaken." I laughed.

Before I could finish speaking, my fingers suddenly opened, my shoulders sank, and I dug a large stone from the wall.

"And then." I threw the stone to Xiao Yuanba.

"Amazing, amazing." Xiao Yuanba's body shook slightly, and he had firmly caught the stone. "Wow...... This stone ......"

There is a reason why Xiao Yuanba was surprised.

For the stone he held in his hand was rough and uneven on the surface, but smooth on the inside.

Even if all five of my fingers were knives, I wouldn't be able to cut through such a smooth stone.

Seeing Xiao Yuanba's stunned expression, I smiled slightly, and threw out a few more similar stones.

"Have you ever heard such a joke?" I said as I dug up the stones......

"There are two people who live on the east and west sides of the same mountain, and they have to cross the mountains and go to each other's villages and towns every day to work, so they often meet at the top of the mountain.

One day, they met again.

The people who live on the east side then suggested: 'Why don't we just dig a passage in the mountains and get out, so that it will be easier to go back and forth?' ’

'How to dig?' The man who lives on the west side asks.

It's simple. The man who lives on the east side said, 'You dig from your house to me, and I will dig from my house to you, and when we meet, won't a passage in the mountains be dug?' ’

What if we don't? Those who live on the west side have questions.

Then we've got two passages. Said the man who lived on the east side. ”

The joke is over.

There was a brief silence.

"Ha, ha, ha." Xiao Yuanba sneered a few times.

"It's a bit cold, but it illustrates the problem that when one moves forward without a reference, it's easy to take a detour — like walking in a straight line with one's eyes closed." I said.

"I won't." Xiao Yuan said domineeringly, "I can walk very straight with my eyes closed." ”

"Most of them don't." "So, it's not easy to dig another tunnel next to the tunnel, and the craftsmen have to prepare at least a few 'stars' on the way." ”

"What is a 'star'?" Xiao Yuanba asked.

"The so-called 'star point' is actually a positioning point, because its function is like a star in the sky, which can make people distinguish the current position, so it is called a 'star point'." I explained.

"How can you tell the difference?" Xiao Yuanba asked.

"That's where two props come in." I said, "The first one is a black meteorite, and the second one you may have heard of is Sinan." ”

"Sinan, is it Sinanpan that you mean?" Xiao Yuan is domineering.

"Sinan Pan is just a branch of Sinan." I said, "In addition to Sinanpan, there are also water Sinan, Tusinan, Tiesinan and Sinan cars, when digging tunnels, it should be Sinan cars." ”

"And how do you position these two things?" Xiao Yuanba continued to ask.

"It's actually simple." I said, "As long as the black meteorite is placed on one side of the tunnel and the Sinan car is placed on the other side, in this way, the Sinan car can sense the direction of the black meteorite in the air, and follow the direction indicated by the Sinan car, and naturally a straight line can be dug out." ”

"I see." Xiao Yuanba said thoughtfully, "Then this military path was also dug out in this way?" ”

"The effective range of this method is generally not more than 100 zhang." I said, "The Qiushan Tunnel is several miles long, and the specific process must be a little more complicated, but the principle is the same - as long as you dig a horizontal ditch in the tunnel that has been repaired next door every 100 zhang, and push the black meteorite into the horizontal ditch, you can locate the Sinan car." ”

"I see." Xiao Yuanba grinned, "That is to say, every other distance, there must be a hole in this wall, but it was later blocked with stones." ”

"That's right." I nodded.

As he spoke, the stones were dug up, revealing a narrow path more than two feet wide.

Rather than a narrow door, it is more like a narrow door—on the opposite side of the door, there are many pairs of eyes looking curiously in this direction.

"Tunnel maintenance, everyone keep going, don't walk around." I said casually, pulling Xiao Yuanba through the narrow door.

Although it caused a small commotion, the tunnel was so long and there were so many people that we mixed in with the crowd and walked for a while, and the commotion naturally subsided.

"Master, what should I do now?" Xiao Yuanba asked.

"I'll buy you a dress first." I said.

This is not a difficult thing, the tunnel is crowded with people, and there are naturally many children whose body shape is close to Xiao Yuanba.

I bought two sets of old clothes, one large and one small, from one family, and asked Xiao Yuanba to change them into, and then I changed his appearance with ease.

As for me, after changing my appearance and putting on my old clothes, I used the technique of dark luck somersault to forcibly raise my body by half a foot.

"If you make it like this, I'm afraid my mother won't recognize me." Xiao Yuanba squeezed his eyebrows and said.

"Don't be silent when you pass the checkpoint, pretend to be dumb." I admonished.

"Can you pretend to be a smart and cute kid who talks a lot?" Xiao Yuan is domineering.

"Who's talking? I can't hear clearly. I looked around and said.

Xiao Yuanba obediently shut up.

Inevitably having a lot of dreams at night, I pulled Xiao Yuanba through the crowd quickly, until I saw the light at the mouth of the tunnel in the distance, and then slowed down and followed closely behind a large group of refugees.

"Fellow, where are you going?" Idle, I casually asked a ragged man beside me.

"What fellow." The man said impatiently, "Which way are you on?" ”

"Oh?" I looked sideways and said, "My family is on the Drop Horse Trail." ”

"Bah, unbreathable guy." The man hummed and didn't bother with me anymore.

After another distance, we were getting closer and closer to the checkpoint.

"What are you going to say later?" I asked Xiao Yuanba.

"Ahh Xiao Yuanba opened his mouth and said.

"Not bad." I give a thumbs up.

After walking a dozen or so steps, the checkpoint is close in sight.

My eyes narrowed—there were hundreds of soldiers waiting outside the checkpoint.

Hum.

I sneered in my heart.

What's the use of having more soldiers? It is impossible to recognize me among thousands.

Hold on, let's go first.

I took Xiao Yuanba's hand, pretended to be sincerely afraid, and walked to the sentry post with a trembling step.

Three-step, two-step, one-step......

When it was too late, a person suddenly appeared in the diagonal slope.

Li Jiuyao!