The cave is completely enclosed and you can't see outside, so it's pitch black inside.

But Xu Xin and Ji Chaoyang had already eaten the red berries, and Silver King and Coco could see in the dark, so they were not affected.

It was very quiet in the cave. The sound of their footsteps on the slippery ground was so clear that they could even hear the occasional sound of dripping water.

After tens or even millions of years of dissolution and sedimentation, the terrain inside the cave is rugged and very slippery. If you are not careful, you will easily trip and fall to the ground. If you happen to hit the sharp stone pillars, you will probably be seriously injured.

This is not one of those caves on Earth that have been treated for tourism, so Xu Xin walked very carefully.

"Ying!" Keke jumped down from Xu Xin's shoulder and ran to the front.

"Be careful, don't run around!" Xu Xin was a little helpless. This little guy always ran around. Although he could find something special every time, it really scared him every time.

The Silver King was quite obedient, following Xu Xin the entire time. Its larger size made it a bit difficult to walk on this rugged terrain dotted with rock pillars, but it was still much more stable than a human walking on two legs.

"Hmm!" Coco responded from the front.

Its small size makes it easier for it to move through the cave.

"Are we still in this circle of hills now?" Ji Chaoyang asked Xu Xin, holding on to a sharp stone pillar in front of him.

"Yes, it should still be in the hills." Xu Xin had been paying attention to the map. Their current location was in the hills, and the direction of the cave's curvature was consistent with the direction of the hills connecting together. It should be a cave in this connected hills.

Of course, it could also be underground. After all, Xu Xin's map can only show the plane position, not the vertical depth.

Continuing to walk forward, both of them heard the faint sound of flowing water.

There should be living water flowing ahead.

However, they were not surprised. The cave was formed by water erosion. It was normal to have flowing water in the cave. It would be abnormal if there was no water.

Soon, after walking forward for a few hundred meters, the two came to a very clear stream.

The water flow was not fast, it could even be said to be slow. This water flowed along the hole in front, but did not flow into the cave where Xu Xin was now. Instead, it turned and flowed into a dark underground cave on the side.

That's not a place they can go.

Keke was standing by the stream at this time. When she saw Xu Xin coming, she immediately let out a cry and ran to Xu Xin's feet.

"This water flow is quite big." Xu Xin estimated the depth of the water flow, which must be at least two meters.

Although the caves were formed by river erosion, there are no rivers around or inside the hilly reserve. There is only a relatively large lake in the middle.

Could it be an underground river?

Ji Chaoyang squatted by the river and carefully observed the creatures in the water.

"There are fish in the river, and they have eyes. It's pitch black here. If it's a species that has been living in this dark hole, the fish's eyes should have degenerated." Ji Chaoyang looked at a motionless black fish path in the water.

"In other words, these fish came in from outside?" Xu Xin's eyes lit up. "Then as long as we go upstream along the river, we should be able to get out."

Moreover, the direction of the upstream river happens to be along this circle of hills towards the salt mine cave and the giant's head.

If there is any secret, it must be next to the giant's head.

"Well, let's continue upstream."

The river did not occupy all the space in the cave. Xu Xin and the others continued walking forward along the river.

"Ying!" Coco ran to the front again.

The ground had become even more slippery, and although there was still a path, it was already very narrow, so Xu Xin and the others could only move forward more carefully. However, this also slowed their speed down considerably.

"You should be able to swim, right?" Xu Xin said to Ji Chaoyang who was also moving forward cautiously.

The current speed of progress is too slow. It will be dark outside in a few hours. At this speed, I am afraid we may not be able to find the exit tonight.

There are still many things to do today. I have to take Li Yajun to Li Wenxi's tree house, improve the decoration and the success rate of alchemy, and try to make the coordinates before tomorrow to connect the four tree houses here.

Although Ji Chaoyang also said that it is unlikely that snow will fall tomorrow, we still need to make adequate preparations.

So they can't spend too much time here.

Moreover, if they didn't go out and couldn't contact the outside world, Li Wenxi and Qi Xuefei would be in a bad situation. They didn't have any mounts, so did they have to stay outside and wait, or walk back by themselves?

"Of course I can swim. During the rainy season, I also eliminated tornadoes, although I was a step slower than you." Ji Chaoyang dodged a sharp stalactite column and turned to look at him. "Why, you want to swim upstream?"

"That's indeed my plan." Xu Xin looked at the river channel with a relatively slow flow.

What he is wearing now is a purple-level scale armor set, and water is also his home ground!

"...I have no problem with it." Ji Chaoyang thought this was a good suggestion.

Although it might be dangerous underwater, the road is so difficult to walk on that the risk factor is no less than underwater. Moreover, the water here is very clear, and both of them have night vision, so there is no obstruction of vision.

My dear, there is more to this chapter. Please click on the next page to continue reading. It will be even more exciting later!