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There is a ravine between each mountain. If you don't want to climb the mountain, it will be easier to walk in this ravine.

The connection between the ravines is equivalent to a natural road.

The exit location chosen by Chu Yang is equivalent to a narrow alley on a fork in the road, which is generally not chosen by humans or beasts as a route to advance.

However, it is hard to say when the beast tide comes. The beasts are crowded and there is no way to go. As long as there is a passable place, they will go through.

So Chu Yang had to make some arrangements at the entrance of the cave, so that the entrance of the cave is still a few meters away from the bottom of the ground, and then dug a few steps of stairs diagonally, and finally left a narrow step more than one meter high at the bottom.

This step will not create any obstacles for humans, but it is not conspicuous in the eyes of beasts and can be easily mistaken for an ordinary stone wall.

Then, the outer periphery of the stairs is covered with shrubs and weeds, including the entrance of the cave, and long weeds are inserted on it to slightly cover the entrance of the cave.

Chu Yang doesn't know whether this arrangement is useful.

Anyway, he should try to make the entrance of the cave more hidden without affecting the passage.

The real safety measures are not outside the cave, but inside the cave.

After passing through this artificially excavated passage, Chu Yang also arranged a slanted doorway inside the cave.

The door is blocked by a large stone, which is not particularly heavy, but it can only be moved by levers.

It is convenient to close the door. Use a small tree trunk to support it, and the door stone will fall down and block the doorway.

After closing the door, use a few small stones to support the back of the door stone to support the slanted stone wall behind it.

In this way, the stones at the entrance of the cave are fixed, and it is difficult to push them open even if a god comes.

Unless the person pushing the door has enough strength to squeeze these stones into gravel powder.

The advantage of doing this is that it is safe enough. The disadvantage is that the entrance is a little narrow, and a lot of space is occupied by the door stone and the stone wall. It takes some effort to open the door, and people have to be arranged to guard the entrance of the cave at all times.

But all this is worth it. When the beast tide comes, it is more important than anything else to be able to defend without spending effort.

After opening the exit, Chu Yang ate some dried meat and immediately took the time to rest.

At this time, Pita had already slept and began to return to the direction of the Bird's Mouth Spring.

According to their estimation, Su Hai should have returned to the team, and Gu Qi should have led the team to the underground river at this time.

This time, Pita should be able to meet the team at the Bird's Mouth Spring, and then notify Gu Qi to go directly to the exit of Lujiao Village.

This can save the waiting time of the team. If Su Hai and his team really have to run back and forth, at least two days will be wasted.

As for Chu Yang himself, he decided to continue to explore the front of the underground river.

In fact, he could also go out from the exit here, find a nearby village, and then notify the villagers to move to the underground river.

But he was not familiar with the nearby terrain, nor was he familiar with the villagers in the nearby villages. Even if he found those villages, it would be unlikely to convince the villagers to enter the underground river cave.

It will be different when Gu Qi's team comes up. There must be people in the team who are familiar with the nearby terrain. Gu Qi can easily persuade the nearby villages to quickly retreat to the cave.

This is the best plan to avoid the beast tide. Others, even if they retreat all the way out of the mountains and retreat to Green Lake Village, may not guarantee real safety.

A few hours later, Chu Yang recovered and began to explore the underground river.

It is also necessary to continue exploring, because the exit near the Deer Horn Village may soon be surrounded by the beast tide.

If other exits can be found later, it will be more convenient for humans to evacuate.

Since we plan to play the tunnel warfare mode, the more exits the better, and the larger the distribution range and distance, the better.

If we can appear in every area of ​​this world through the underground river, then the underground world will be the trump card for human survival.

In addition, Chu Yang is also very curious about the end of the underground river. Even if he can't find more passages, he plans to go over and take a look.

When Peeta left, he left all the dried meat to Chu Yang, which was enough for Chu Yang to stay in the underground river for a week or so.

This time, Chu Yang walked for two days in one go, and he only slept for a few hours when he was tired.

Two days later, fluorite appeared in the passage again, stretching for more than ten miles.

After more than ten miles, the river forked again.

This time there were three forks, and three forks of similar size, which looked neat and tidy, and were completely man-made.

What kind of powerful person could actually dig such a long and spacious passage underground?

Chu Yang was very shocked. Even for a cultivator, it would not be an easy task to complete such a large project.

It would probably take a sect of cultivators, or a large organization of cultivators, to complete such a huge project.

There is no spiritual energy in the Wu clan world, so where do so many cultivators come from?

Could it be that before the Wu clan came to this world, there were other races that lived here?

What was their purpose in building such a large project underground?

Chu Yang could not guess the answer, so he could only continue to explore.

There were three forks in the road, and he chose the middle one.

He felt that this was the most likely route leading to the end of the passage, and the other two forks were likely to be the other two exits.

He had no intention of exploring the exit for the time being, because according to the distance, this place was almost outside the mountain.

The beast tide would not reach the outside of the mountain so quickly, so the intelligence team did not need to rush to contact the village outside the mountain.

Gu Qi would definitely send someone to follow up, and then they would have plenty of time to slowly find the exit.

Chu Yang quickened his pace, hoping that after exploring this underground world, he could go back to participate in the work of the intelligence team.

Without him, the God of Killing, the work of the intelligence team was actually quite stressful.

After walking for two more days, Chu Yang finally stopped.

The underground river stopped abruptly, and the passage came to an end.

The end of the passage was not a stone wall, nor was it a sea formed by the confluence of river water.

There was only one thing that Chu Yang was very familiar with in this place, the space passage.

It was not the kind of torn and broken space crack, but a complete, undamaged passage.

Chu Yang was very surprised, but it did not seem to be something surprising that the space passage appeared in such a strange underground world.

Such a magical and huge underground project, coupled with such a mysterious space passage, is completely reasonable.

Since Chu Yang has come here, the next step is naturally to walk into the space passage.