When they came out again, the rope was not long enough. Zhou Xiang took out a rope and Ling Ran connected it. They continued to slide down. Under the light of the flashlight, they seemed to be able to see the bottom of the cave.

After connecting another rope, I landed on the ground, and saw another horizontal cave entrance. This cave was square, about 3 meters long, wide and high.

The cave was not damp and there was no feeling of suffocation. Ling Ran walked towards the horizontal cave. After about ten meters, a long tunnel perpendicular to the square cave entrance appeared in front of him.

Yes, it’s authentic.

Zhou Xiang looked back at the length of the square hole, then looked at Ling Ran. "Ling Ran, do you think this long tunnel in front of us is under the North-South Street? The ten-meter square hole just now was about the same length as the pond to the street."

Ling Ran nodded, "It should be, and it's not suffocating anymore. There should be ventilation holes at both ends."

"Put me down, let's check both ends."

Ling Ran untied the cloth strips around his body, rolled them into a ball, and threw them into his wooden house. He then took Zhou Xiang's hand and said, "Let's go to the south first. That section seems to be shorter."

Zhou Xiang obediently let Ling Ran lead the way, sweeping the flashlight in his hand to both sides. The two earth walls in the tunnel were rammed very solidly. Every two meters or so, there were stone pillars on both sides of the earth wall, with thick wooden beams placed across the pillars. No wonder the street above had not collapsed after decades.

It felt like we had passed the provincial road before we reached the end. There was a small vent at the end, but I couldn't tell where the wind came from, after all, it was about 40 meters underground.

"Turn back and go over there."

In the long tunnel, there were only the sounds of two people's footsteps, which felt a bit scary.