When Xu Tianyu entered the cave, he realized that it was probably a tunnel left behind by an animal. It wasn't big, and he could barely move forward by lying on his stomach.
"Crawl, crawl."
After half an hour, Xu Tianyu and the others finally came out of the cave.
They were at the edge of Stone City's walls, looking at the dilapidated buildings around them.
Xu Tianyu predicted that they were in the Slums.
"White Devil, bring some people to look around. Be careful, don't be discovered by the Demons."
"Okay."
The White Devil left with the seven players, while Xu Tianyu brought Yang Qin to a decent looking house.
There were cobwebs and dust everywhere in the house. It was obvious that it had been abandoned for a long time.
"Master, this house was left behind by the residents of Stone City. No one has lived here since the Demons occupied it."
"Okay."
Xu Tianyu nodded and said.
"Yang Qin, do you know of a way to topple the walls?"
Xu Tianyu saw that the walls were weathered. It was obvious that the Demons of Stone City didn't repair the walls.
If they could topple the walls of Stone City, they would have the advantage in this victory.
"Master, it's very difficult to topple the walls. The walls of Stone City are more than five meters thick. Although the surface is weathered, the inside is made of solid obsidian. It's very difficult to destroy it. Even the Spider Queen's self-destructing spiders can't do it."
Xu Tianyu didn't feel unlucky. Instead, he thought of the cave they had just entered.
"Yang Qin, we can see from the hole that we just came in that the ground underneath the city wall is just soil. If we hollow out the ground underneath the city wall and bombard it with the self-exploding spiders, is there a possibility that we can push it down?"
This time, Yang Qin was silent. She was considering the possibility of Xu Tianyu's words.
"Master, I have to say that your idea is very good. However, Stone City covers an area of more than ten kilometers. It's very difficult to hollow out the outer walls. Moreover, there's a lot of noise when digging. It's hard to be sure that the Demons won't discover us."
"Hehe, it's fine as long as it's feasible. We have plenty of time."
Xu Tianyu smiled. He had not forgotten that he had successfully researched the Blackback Pangolin.
Although there weren't many of them, their ability to dig holes was definitely very impressive.
Previously, it had only taken them two days to dig through the entire Demon Lake.
Although Boulder City was much larger than the Devil Lake, the Blackback Pangolin could definitely complete its mission in five days.
Thinking of a solution, Xu Tianyu immediately contacted Huang Jiajie. Previously, after digging the hole, the Blackback Pangolin was useless.
Therefore, Xu Tianyu brought the Blackback Pangolin back to Tenyu City to raise. Unexpectedly, it was time for them to show off their skills again.
Huang Jiajie quickly replied. He estimated that he would deliver the Blackback Pangolin to Boulder City within two days.
After Xu Tianyu instructed the players on the river to provide support, he prepared to explore Stone City again.
Xu Tianyu shuttled through the rooms, but the results weren't very good. He didn't discover anything.
At this moment, the White Devil and the others returned.
"Tenyu, we've explored Boulder City. We discovered that the entire city is divided into an inner city and an outer city. The inner city's walls are only five meters tall and not very thick. All the Demons live in the inner city."