The brothers, one after the other, were like two swimming fish, following the slowly flowing dark river and diving into the dark river channel on the left side of the stone cave.

The river was not very wide, and the two brothers were not afraid to lose their way, so they just quickened and moved forward.

After about ten minutes, I felt that the speed of the water was getting faster and faster, but the river bent left and right, and if I was not careful, I would be washed by the current and hit the stone wall at the turn.

However, in this way, the two of them saved a lot of effort, just pay attention not to hit the stone wall too hard.

After another seven or eight minutes like this, the speed of the water gradually slowed down, and the brothers paddled with all their might, and suddenly a buoyant upward buoyancy pushed them into a narrow passage.

The passage was oval-shaped, about three meters wide at its widest point and less than two meters at its narrowest point.

The brothers turned left in the passage and sneaked around for a few minutes, when they suddenly felt a loosening of their bodies and emerged from the water.

This sneak didn't last more than thirty minutes, and it was still far from the limit of the two brothers, but the two of them still couldn't wait to breathe in the delicious air before Tie Niu asked, "Lao Bai, won't we come out of the dark river again so soon, right?"

Poplar didn't say anything, but looked around.

He soon found that they were in a wide, deep pool surrounded by steep rock walls.

In other words, they didn't go outside, but swam down the current to another cave.

"I said why did I come out so quickly, but I didn't expect to enter another stone cave!" said Tie Niu, while also looking left and right, "But this water is also strange, we were sneaking in the water just now, obviously feeling a big drop, why didn't the water flow silt up and fill the entire cave?"

"There's nothing strange about that," replied Poplar, "after all, the water is still flowing, and the further down it goes, the faster it goes, the cavern has another outlet for draining." Further, there is a section of the waterway up that is particularly narrow, so naturally the water level here remains the same. ”

"According to what you say, we have to dive into the dark river again to continue our adventure?" said Tie Niu, and suddenly had a strange thought, "Old Bai, do you say that this is the abyss where the man in black fell?

"Possibly!" Poplar nodded, "Let's dive into the water and see, if it's really the bottom of the fairy cave, then there should be that big bronze box in this water!"

"Yes, if we can find that big box, we can also see what is in the middle layer of the box!"

Iron Bull immediately seemed excited, and took a deep breath with Poplar to dive back into the water.

Unexpectedly, as soon as he dived into the water, Poplar first felt a strange wave of water, which rushed towards him in the direction of the current.

Poplar's eyes hadn't seen what was going on, and his body had already rolled along the current, dodging the head-on impact of the current, so he couldn't help but be surprised.

He saw a large, translucent fish swimming past him.

The size of the fish was larger than the transparent fierce fish that had been slaughtered in the fairy cave before, and it was not only this transparent fish, he saw several other translucent big fish looming out of the deep water.

Glancing at the Iron Bull, as if he had not yet realized that danger was imminent, Poplar was in a hurry, so he had to take out the dagger he carried with him, and slashed at the transparent fish that passed by, and at the same time floated up with the power of this stroke and kicked at the Iron Bull.

The big transparent fish had already rushed close to the Iron Bull, but it was slashed by the poplar, and it immediately turned its body, revealing its huge mouth and sharp teeth towards the poplar.

Iron Bull was kicked by Poplar, and he was also alert.

A translucent big fish came up from below, and a big mouth bit at Tie Niu's left calf, Tie Niu hurriedly shrank his legs, flipped in the water, and took out a dagger to counterattack the transparent big fish.

Poplar cut a big hole in the largest transparent fish with a single sword, and the blue fish blood immediately spread in the pool water.

Then the fish twisted its body and bit at the poplar, which was far less agile in the water than the swimming fish, and could only stick to the body of the fish and poke it with a knife.

More blue fish blood gushed out, staining the vast pool of water around the poplar blue.

But the fish was stabbed twice by the poplar, not only did not flinch and escaped, but became ferocious, and even swung its tail violently in the water, and its wide open mouth bit at the poplar.

At the same time, two other transparent fish that emerged from the depths of the pool also rushed towards the poplars.

Whitewood was attacked on three sides and could only take risks, and he swung it out with one hand, projecting the dagger in his hand into the wide open mouth of the big injured fish that pounced in front of him.

The fish didn't know what it was throwing because its mouth was so big, but it felt a pain in its mouth, and it instinctively shut up immediately.

Poplar took the opportunity to reach out and put a touch on the roof of the fish's jaw, and with the power of this ride, his whole body turned upward.

The other two transparent big fish just pounced on the front, and quickly swung their tails in the water and turned in hot pursuit.

The injured fish didn't mention swallowing the dagger, and it was so painful that it kept writhing and struggling in the water, stirring the undercurrent in the pool.

Over there, Tie Niu concentrated on fighting a translucent big fish alone, and in just a blink of an eye, he had already slashed three times on the big fish.

One of the slashes slashed through the fish's abdomen, and although it did not disembowel, it still caused serious injuries and blue blood spilled over its body.

The fish still wanted to continue chasing after the iron bull, but it was obviously slow and unable to do so.

On the other side, Poplar had no weapons, so he could only take advantage of the undercurrent stirred up by the big fish that swallowed the dagger, and rolled in the water to avoid the fierce pursuit of the two translucent big fish.

Iron Bull glimpsed that Poplar was in critical condition, and ignored the heavily injured translucent fish, kicked the water under his feet, and flew towards Poplar.

It happened that the poplar was attacked by two translucent big fish on both sides, and at this time it was already unavoidable, and the iron bull arrived in time and stabbed a dagger into the body of one of the big fish.

The fish suffered pain and immediately turned its body to bite the iron bull.

Poplar seized the opportunity to grab the fish's violently swinging tail, and with the force of the fish's tail, his body flipped upward, avoiding the gaping mouth of the other big fish, and rolled onto the back of the fish.

The fish turned around again to chase after the poplar, but while it was twisting, the poplar reached out and borrowed a little force on its slippery dorsal fin, and the whole body immediately clinged to the fish's back, and his hands stretched out and pinched into the fish's two large bulging eyes.

The fish rolled violently in the water, throwing the entire aspen down the water.

But the fish's eyes were down, and the pain was so severe that it naturally couldn't continue to pursue the poplar.

At the same time, the Iron Bull slashed another large translucent fish.

Although the fish was fierce, it was much worse than the deep-sea eel and the sharp-headed ghost fish, and it was far from being an iron bull's opponent in one-on-one.

Poplar lost his weapon, and it was difficult to kill such a big fish in one blow, so he could only watch the movements of the three injured big fish in the water.

However, I saw that the big fish that swallowed the dagger and the big fish that was hit first by the iron bull all turned over their bellies and slowly surfaced, obviously completely killed.

And the big fish that was blinded by his hands rushed left and right in the water, like a headless fly.

Knowing that the blind fish was no longer a threat, Poplar ignored it, and just watched the fight between the Iron Bull and the last big fish.

At this moment, the big fish was already scarred, wisps of blue blood were constantly spilling from it, even if the iron bull stopped hurting it again, it was afraid that it would not live long.

There was some pity in Poplar's heart, although this fish was fierce, after all, it was a new species that had never been discovered by the world.

What's more, this fish is hidden deep in the dark river, if they hadn't broken into other people's territory first, no matter how fierce they were, it had nothing to do with them.

So Poplar swam close to the Iron Bull and reached out to pull him to stop him from continuing to attack the big, translucent fish covered in wounds.

Although the fish was fierce by nature, after all, it was already covered in wounds, and since the Iron Bull stopped attacking, it did not dare to continue to attack.

Instead, he grinned and swam around the aspen iron bull twice

(See Chapter 479 "The Secret of the Copper Box")