On the left, no, a little further ahead, where the sound and vibration of the water flow comes from

Little by little, confirming the sound of the river churning and shaking, Kurokawa moved slowly, feeling the movement, observing the scene around him.

Indeed, this direction is indeed the lowest-lying area in the vicinity, and the water vapor is getting thicker, and although there is no water source in sight, it is much better than the aimless search before.

Taking a deep breath of moist air and continuing to search in this direction, Kurokawa immediately discovered an unusual spot - a small stone valley sunken in.

The surrounding vegetation and bushes have completely covered the area, and it is impossible to find it from the trees, and you can only find it if you walk nearby.

The valley is full of pebbles and craggy stone walls, the slope is relatively steep, and the height is not low, but it is not a problem for Kurokawa, and the strange thing is that there are no plants in this stone valley, not even the slightest weed, which is very surprising.

Sure there was no danger, he jumped into it and observed it.

Although the stone valley looks relatively narrow, it is very long, standing in it and unable to see the end of the two ends, stroking the lines on the stone wall, which can indeed only be obtained by the impact of flowing water for many years, and even when touching it, Kurokawa can feel the shock of waves crashing against the stone wall.

Although it is very slight and the source is not nearby, there is no doubt that there is water in the vicinity, and even that this stone valley is a dry river.

The water source is already very close to here...... But I still didn't see any water.

With a blank eye, Kurokawa looked at the bottom of the valley in the stone valley, and an idea appeared in his mind, and he speculated with some uncertainty, "Water, shouldn't it be at the bottom of this valley?"

Squatting down and bending down, Kurokawa stretched out his hand and pressed against the washed smooth stone slab at the bottom of the valley, feeling the shock.

The subtle vibrations kept coming, and it felt like a dissatisfied water bottle with water dangling in your hand, and there was a churning feeling of being impacted.

That's right, right here, right down here!

Nodding, he slowly stood up, confirming this.

It's an underground river, just below this rocky valley, and it's not far from the surface.

It is not far from the bottom of the stone valley in this low-lying area, and the place where Kurokawa used to find water sources was less than a few hundred meters away from here, but the height was more than ten or twenty meters away, in other words, if it was at the height of that plain area, it would have been necessary to dig down a few tens of meters to dig it.

In fact, underground rivers are also a very common form of water source.

In the summer rainy season, because this is the lowest area surrounded by several surrounding mountains, all the rainwater that has not had time to seep into the soil will gather here, pour into the underground river through the karst cave, fill it with the stone valley, and form a mighty river, which rushes in the direction of this canyon.

Kurokawa guessed that the rivers and lakes mentioned by the traveling merchants should be true, and they came to the mountains to trade goods, basically during the period when the rainy season had just ended, when the stagnant water must have not had time to seep into the ground and be carried away by the dark river, so there would be a record of rivers and lakes in the east.

As for the water, it is better to understand that there must have been a few years of particularly heavy rain over the years, and the water accumulated far more than before, and even the river valley could not carry so much water, so it overflowed and turned into a quiet little lake in the valley, which is not surprising at all.

"It's around here, but it's still a little off, it's not at the bottom of this rock valley. ”

After exploring around, Kurokawa learned more and more about this place, and found a karst cave that was directly connected to the underground dark river, "This karst cave is too small for me to pass, and it may not be a straight line during the period, there must be larger karst caves, but it is not easy to find, but it is better to find the location directly and dig a big pit to see." ”

Without hesitation, he went straight to find a suitable place and began to prepare to dig a pit.

The whole area around is stony ground, many big trees are rooted in the stone cracks, if you have to say, although this is the closest distance from the underground dark river, it is estimated that it is only about four or five meters away, but it is not a good place to dig a pit, even if ordinary people have the right tools, it takes half a day to leave a small pit here, let alone dig a big pit up to five meters deep.

But Kurokawa is no ordinary person.

His fists are far better than the so-called proper tools!

"Boom!"

With a loud bang, Kurokawa's face turned fierce, he clenched his fist, pulled it out of the fist mark on the ground, raised it high, and then swung it to the ground again!

"Boom!"

Fragments of stone chips burst out and splattered all around, shaking the leaves and branches of the trees, and even the main trunks of the trees showed white marks.

And Kurokawa didn't stop, and continued to smash his fists to the earth!

The feeling of destruction is really comfortable, looking at the chaos and countless cracks of the stones on the ground, he can't stop at all!

"Boom, boom, boom!"

Each punch was thrown like a piledriver, making a violent roar, but it went deeper than the last time.

With four punches in a row, the prototype of a large pit has appeared.

And Kurokawa's face did not change, he didn't even catch his breath, and after pausing for a little to find the next place to shoot, he continued to swing his fist without hesitation!

Now, after the core strengthens his body, his skin has long been tougher than the oldest old cowhide, even if it is with the cortex of the demon beast, that is, between the two lieutenants, it is not very clear that there is no specific comparison, but it is indeed invulnerable in the conventional sense.

Throwing a fist at a stone may seem like a stupid act of self-harm, but for Kurokawa, it's not fundamentally different from playing with sand, and with his strength, he can turn an ordinary stone into dust and stone chips with just a light grip, even if it's an ordinary snap of his fingers, he can easily leave a finger mark on the stone, and he won't even feel pain.

Continue to open up the size of the stone pit, pay attention to the power of your fists, lest you accidentally break through the stone wall and fall into the underground river, which is not beautiful.

After all, he only knew that there was a dark river below, and how thick the stones were—he didn't study mathematics, physics, and civil engineering, so how could he estimate it? Even if he really studied this, he didn't know where he had forgotten it for more than ten years.

It's still a little slower.

After a while, temporarily stopping, waiting for the dust and lime to dissipate and settle, Kurokawa looked at the big pit in front of him that was two or three meters long, one or two meters wide, and half a person deep, and showed a trace of impatience on his face.

Although there is no problem and it is not very tiring, it is estimated that it will take the evening to make a hole, and it will be almost dark at that time, so what is the point?

After thinking about it for a while, Kurokawa took a deep breath, adjusted his breathing, and calmed his mind, and the crimson blood qi poured out from the inside of his body, attracting the free aura between heaven and earth, converging on his right fist.

"Eat me - a punch!"