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Gu Qi had no objection to Chu Yang's arrangement. If he was just exploring the road, he really wouldn't need too many people. Too many people would actually affect the speed of travel.

The three of them were almost done exploring the route. With Chu Yang around, there was no need to worry too much about safety.

Others can just take a few days to rest and let their bodies recover from their injuries.

If the underground river is impassable, the team that has rested for a few days will be in better marching condition, and the journey will be faster.

After Chu Yang and the water team left, Gu Qi immediately arranged for the team to rest.

It was not suitable to take any action during the day. There were too many beasts outside and it was too dangerous, so they could only recharge their batteries.

Except for a few sentries left near the entrance of the cave, everyone else went a hundred meters deep into the cave. Then they each found a place and began to sleep peacefully.

Time soon came to night, and the warriors who had eaten regained their mental and physical strength.

Gu Qi selected a small group of warriors who were in good condition and prepared to hunt a few wild beasts to replenish the dry food he carried.

The rest of the people went to collect firewood near the entrance of the cave and prepared a large number of torches.

At the same time, Chu Yang and the other three were exhausted from walking in the underground river.

The water in the underground river is very shallow, so there is no problem in wading directly in the river.

However, because the groundwater was too cold, the three of them could only walk along the river bank.

The river bank was also surprisingly flat, which did not affect their ability to walk quickly along the river bank.

Chu Yang estimated that this river bank used to be a river channel. It was due to the constant erosion of the river water that it could be washed so neatly.

But now it happened to be a time of low water, so the river narrowed slightly, leaving them with a convenient passage for walking.

What's even more convenient is that the passage where the underground river is located is also very spacious, just like a tunnel opened inside the mountain. It's no problem to take the subway.

Traveling in such terrain is naturally several times faster than traveling on the ground.

What's even stranger is that this passage is basically straight.

Even if there are curves, they are the kind of curves with large and gentle curves, like highways, and will not turn around randomly.

Is this really an underground river formed by nature itself?

The three people became more and more confused.

After traveling all day long, the three of them were finally exhausted.

They didn't sleep or rest during the day, and they basically didn't stop along the way. Even when they were eating dried meat, they were walking slowly.

As a scout and an elite warrior, I can still withstand this level of physical exertion.

However, Chu Yang felt that there was no need to exhaust his energy, so he asked Su Hai to put out the torch and prepare to take a rest.

After putting out the torch, everyone felt a little uncomfortable with the sight.

After calming down for a while, Chu Yang realized something was wrong.

There was a faint light in the passage ahead.

"Is there an exit in front?"

Su Hai screamed in surprise.

Chu Yang's heart moved: "How far have we walked this whole day?"

Su Hai calculated it and found that the average speed they were traveling at was about five kilometers per hour. If they walked for a whole day, they would cover a hundred miles a day.

Moreover, they walked basically in a straight line, and the direction was indeed eastward. After calculation, they should not be far from Bird's Mouth Spring.

"Is there Bird's Mouth Spring in front of you? Is there an exit over there?"

Su Hai suddenly became excited.

Peeta on the side immediately denied: "Impossible. Bird's Beak Spring only has a gap in the spring. There is no entrance or exit at all. If there is an exit in front, it is definitely not leading to Bird's Beak Spring."

Su Hai said quickly: "No matter where it leads, as long as there is an exit, it proves that the underground river is passable, and our team can go directly to the river."

Peeta continued to shake his head: "This is just your guess. There may not be an exit ahead. We are underground now. Even if there is an exit leading to the ground, it is impossible for the light source to reach such a deep underground, right?"

"That's not necessarily true. The terrain in the east is slightly lower, so the water flows to the east. Although we went deep into the ground before, when we got to the east, maybe it was just at the foot of a certain mountain? The entrance to the cave should have just reached the ground. Bar?"

"This is just your guess..."

"This is not speculation, this is inference."

Seeing that the two people were about to argue, Chu Yang immediately interrupted and said, "Don't waste your breath. We'll find out what's going on in front of us when we go over and take a look. Can you guys still hold on?"

"Of course I can hold on."

Although they were very tired, Suhai and Peeta didn't mind walking a few more miles.

The exit may be right in front of them, and they can't rest peacefully unless they go to find out.

So the three of them lit torches again and strode forward.

As the saying goes, it's like running to death when looking up the mountain. The situation in this underground cave is similar. Looking at the light source in front of you, you can cover more than ten miles in one walk.

But the further forward, the brighter the light source becomes, and the stone walls on both sides of the river begin to become gradually clearer.

Finally, Chu Yang saw the light source with his own eyes.

These are some stones embedded in the stone wall, emitting cold fluorescence.

There are a lot of stones, and they extend for an unknown number of kilometers along the passage. They illuminate the entire passage clearly and radiate the light very far.

"It's not an exit...just some glowing stones."

Su Hai felt a little regretful.

Peeta approached curiously, touched the stone on the stone wall with his hand, and asked: "What is this? Night-shining pearl? Such a big night-shining pearl?"

Night-shining pearls have never appeared in this world, and Peeta, a witch blood warrior, has never seen one.

The reason why he knew about night-shining pearls was that he heard those ghost cultivators talking about it when they were chatting.

Su Hai sighed tiredly: "It's not a night-shining pearl, it should be a kind of fluorite... Even if it is a night-shining pearl, it doesn't make any sense. Who in this world cares about gemstones and the like."

"I think it's meaningful."

Peeta stretched out his hand and scratched the glowing stone: "If we can get them down, the team behind us won't have to prepare any torches."

Su Hai smiled: "That's a good idea."

At this point, the two couldn't help but look at Chu Yang again.

When it comes to digging out stone walls and digging stones, no one is more efficient than Chu Yang.

Chu Yang looked at the fluorite on the stone wall hesitantly, and then said: "This thing, it shouldn't be radioactive, right?"

Su Hai thought for a while: "It shouldn't be, they are distributed along such a long passage, and the water source must pass through this passage. If the stones here are really radioactive, then the water source outside would probably have been contaminated long ago."