The cave is completely closed and cannot be seen outside, so the cave is pitch black.

But Xu Xin and Ji Chaoyang had already eaten red currants, and Silver King and Cocoa could have seen things in the dark, so they were not affected.

The cave was very quiet, and the footsteps they were stepping on the slippery ground were so clear that the sound of water dripping from time to time could be captured very clearly by them.

After tens of millions of years of dissolution and deposition, the terrain inside the cave is rugged and very slippery. If you are not careful, you will trip to the ground. If you happen to hit the sharp stone pillars, you may be directly hit.

This is not the processed caves on the earth that are exclusively for tourism, so Xu Xin walked very carefully.

"Yeah!" Coco Xu Xin jumped off her shoulders and ran to the front by herself.

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

The Silver King was very obedient and followed Xu Xin all the time. It was relatively large in size, and it was a little difficult to walk in such a bumpy and protruding place, but it was still much more stable than humans who walked with their feet.

"Yeah!" Coco responded in front.

Its body is small, making it easier to walk through caves.

"Are we still in this circle of hills now?" Ji Chaoyang held a sharp top-down stone pillar blocking his face and asked Xu Xin.

"That's right, it should be still in the hills." Xu Xin has been paying attention to the map. Their current location is in the hills, and the curved direction of this cave is also consistent with the direction of the hills. It should be a cave in the connected hills.

Of course, it may also be underground. After all, Xu Xin’s map can only see the position of the plane and the depth of the longitudinal direction cannot be seen.

Continue to move forward, both of them heard a faint sound of water flowing.

There should be live water flowing ahead.

However, they were not surprised. The cave was formed by erosion of water. It is very normal to have water flowing in the cave, but it is abnormal if there is no one.

Soon, after walking forward for a hundred meters, the two of them arrived at a very clear stream of water.

The flow rate of the water flow is not fast, or even slow. This flow flow flows along the hole in front of you, but does not flow into the hole where Xu Xin is now, but instead it is bent and flows into an underground dark hole on the side.

There is not a place they can go.

Keke was standing by the water flow at this time. When he saw Xu Xin coming, he immediately moaned and ran to Xu Xin's feet.

"This water flow is not small." Xu Xin measured the depth of the water flow, and it was about to be two meters.

Although the caves are all formed by rivers, there are no rivers around and inside the hilly reserve, only a lake with a relatively wide area in the middle.

Could it be, the underground river?

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

"There are fish in the river and eyes. It's pitch black here. If it's a species that has been living in this black hole, the fish's eyes shouldn't have deteriorated." Ji Chaoyang looked at a motionless black fish path in the water.

The two looked at each other and jumped into the river.

"Ao!" The Silver King also jumped into the water with them.

"Oh, it's really a little cold!" Xu Xin shivered. Although the temperature of the air is also very low, it is completely different from the feeling of soaking in water.

"... Let's move quickly, otherwise your hands and feet will freeze." After that, Ji Chaoyang plunged into the water and began to swim forward.

Xu Xin looked at the Silver King and found that it had no problem in the water. He also plunged into the water and followed.

"Yeah!" Coco also followed on the shore.

The depth of this underground river is more than two meters and the width is three or four meters, which is completely enough for them to move in the water.

Once the identification ability is opened, the things under the water will be visible at a glance.

The bottom is full of green stones, and some unknown plants, which are also white and green, and there are not even blue-grade aquatic plants.

After swimming forward for a long time, there was nothing worth noting. Xu Xin and Ji Chaoyang both came up to change their temper.

He looked at the Silver King, and the Silver King followed them closely. His swimming speed was not slow, and he could completely follow the two of them.

Coco was just on the shore. When he saw him coming out, he even screamed "mouth".

"Where is this here?" Ji Chaoyang was a little breathing. Fortunately, when he came in just now, he ate the apricot that could continue to recover his strength, and it was not a big deal.

"...This river flows in this circle of hills. Now we have been swimming around the hills for a little while." Xu Xin has also been paying attention to the map.

The two of them swim very quickly, faster than usual running.

In fact, his speed could be faster, but he was afraid that Ji Chaoyang would not be able to keep up, so he slowed down. However, this allowed him to have enough time to observe the water and surroundings underwater.

"Stay going." Xu Xin plunged into the water again.

The two continued to swim forward.

After swimming for a long time, Xu Xin discovered that the underground river seemed to be getting wider and deeper.

The width before was only three or four meters, and the depth was only about two meters. Now, the depth has reached three or four meters, and the width has reached five or six meters. Even the surrounding caves are much wider than before.

"Yeah!Yeah!" Coco suddenly started shouting on the shore.

Xu Xin and Ji Chaoyang came out of the water one after another.

"Hehe! Hehe!" Keke quickly gestured at the two of them with his little paws.

Xu Xin understood what it meant, felt tightened, and immediately said to Ji Chaoyang: "Let's go up, Keke said that if you go further, there will be danger in the river!"

Ji Chaoyang didn't say nonsense: "Okay!"

The Silver King had already stepped onto the shore twice and shook the water on his body.

Xu Xin swam to the shore and did not go up first, but plunged her head into the water again and looked deeper ahead.

The water was very dark, but his scales and red currants could allow him to see everything in the water. He might be able to see something ahead.

The front is very clear, because the river has a curve, so it cannot be seen far.

Um?!

Xu Xin suddenly discovered two red dots in the river.

Then, the red dots suddenly became a lot, densely packed, all of them quickly approaching here!

...Is that the eyes of mutant creatures?!

"Yeah!" Keke shouted anxiously again on the shore.

Xu Xin suddenly drilled out of the water, supported her hands, rolled directly to the shore, and then quickly got up!

Ji Chaoyang was already on the shore at this time. He was twisting the water from the leather armor. Seeing Xu Xin so nervous, he also looked tight: "What's wrong? What did you see under the water?"

At this time, the cave was already very wide, at least ten meters wide, so the shore was several meters wide. He picked up the cocoa and put it on his shoulder, pulled Ji Chaoyang and Yin Wang away from the river, leaned against the wall of the cave, and looked at the river several meters away.

On the map, many red dots lined up in the shape of a river in the hills and were moving rapidly towards their location!

Ji Chaoyang did not ask any more, but looked at the river and took out a crossbow.

Both of them could already hear the sound of something swimming in a large area under the water!

"Yeah!"

"Here you come!" Xu Xin also took out the crossbow and pointed it at the stream.

"Crash!"

Accompanied by the loud sound of water, a blood-red fish, one meter long, drilled out of the water!

Xu Xin's pupils shrank, and both of Ji Chaoyang pulled the trigger.

"Boom!" Two overlapping explosions sounded, and the fierce flames made both of them temporarily blind for a moment.

This blood-red big fish was directly blown into the water by the explosion.

But the situation has not improved!

At the same time, three blood red fish nearly one meter long jumped out of the river and bit them straight at Xu Xin and the others!

The sharp and irregular fangs on the mouth make people feel numb all over their body!

This is a piranha!
Chapter completed!