Shuo Gang and Martha stand in front of the entrance to the underground cavern.

Up close, it's just a normal big hole, however, the cave is deep and steep.

"Mr. Yangshuo, this underground cave is said to be hundreds of meters deep, and there is only hot magma when you reach the bottom, but there are many forks in the cave at the bottom, so it is best to mark the road so as not to get lost." Martha instructed.

"Thanks for the pointers, I'll pay attention!" Shuogang Road.

Afterwards, Martha took her leave.

Shuo Gang enters the cave and begins to explore the underground cavern.

The cave was steep, but Shuo just walked through it as if he were walking on the ground, and he didn't feel the slightest discomfort.

The cave is indeed very deep, Shuo Gang has traveled a hundred and ten meters in a row, and still can't see the bottom, he continued to move forward, and after more than a hundred meters, he still can't see the bottom. At this point, the cave was already dark, and only a faint light could be seen in the direction of the cave entrance.

However, this did not affect Saugang's vision, as the automaton could see clearly even in the dark.

Shuo Gang continued to move forward, until he went deep for nearly four hundred meters, and then he felt the slightest heat, obviously, he was close to the underground magma.

However, to Shuo Gang's surprise, he went nearly two hundred meters deep before he really saw the surging magma, the magma was rolling, emitting a scorching temperature, if it was an ordinary person, he would have felt uncomfortable, but Shuo Gang did not feel the slightest discomfort.

This is not only because he is a mechanical race, and he is naturally more resistant to heat than humans, but also because he understands the meaning of fire, and any form of fire can make him feel very familiar.

However, in order to protect his cloak and other clothing, Shuo Gang had to cover his surface with a layer of fire to prevent the clothes from burning in the heat.

Is this an underground cavern?

Sure enough, as Martha had said, after reaching the bottom, the cave began to fork and become wider, and even the height of the cave increased considerably.

As Shuo Gang continued to go deeper, he needed to find a place with a higher temperature, and the higher the temperature, the more sufficient the fire energy, the faster Shuo Gang would be able to absorb and replenish the energy.

As he went deeper, Shuo Gang became more and more curious about the underground caves, what kind of caves are there, it is simply an underground world, although this underground world is composed of countless caves, but these caves extend in all directions, connected to each other, forming a vast and independent world, completely different from the ground.

Although the composition of this world is somewhat simple, some are just endless lava with no edge in sight, in Shuogang's view, this is a world, a world of magma and fire.

Shuo Gang continued to go deeper, and before long, he found a place that satisfied him.

The temperature here is extremely high, enough for Shuo Gang to absorb the energy of the fire system.

Shuo began to absorb energy with the scheme he had envisioned.

But the speed of absorption was not always satisfactory to him.

At the speed at which he was absorbing energy, it would take Shuo Gang about ten days to replenish the energy in an energy core, which was too inefficient and had no merit at all.

Shuo Gang had to pause, think carefully, and think about how to improve the way he absorbed energy. After a day's work, Shuo just developed an updated plan to start using an improved method to absorb energy.

After absorbing it for a while, Shuo Gang found that although the speed of absorbing energy had increased a bit, the efficiency was still extremely low, and it still took seven or eight days to replenish the energy in an energy core.

Shuo Gang paused again, thinking about the gains and losses, and improving the way he absorbed energy.

In this way, Shuo Gang improved the way he absorbed energy as he absorbed, but the more he got to the end, the more difficult it became to improve.

After a month passed, Shuo Gang finally replenished the energy in an energy core. The reason why it took so long to replenish so little energy was mainly because Shuo Gang spent most of his time improving the way he absorbed energy.

After a month of hard work, Shuogang's newly improved energy absorption method has been able to absorb energy quickly, many times faster than at the beginning.

Shuo Gang estimated that if he absorbed energy here with his latest energy absorption method, it would only take half a day to replenish the energy in an energy core at the earliest.

However, this speed of energy absorption still did not satisfy Shuo Gang, and he believed that the energy absorption method could still be improved, but after a month of hard thinking, he was now quite tired and did not have much inspiration to improve his energy absorption method.

Shuo Gang decided to leave the underworld and return to the surface, stay on the surface for a while, take a break, and then return here to continue to improve the way of energy absorption.

Although there were many forks in the cave, Shuo had just listened to Martha's advice and marked the path he had passed, so he didn't have to make any effort to identify the road, but only followed the marks he had left behind, and returned to the surface.

I don't know if it's Shuogang's luck, or if the strange creatures in the underworld are too rare, anyway, in this month, Shuogang didn't see the slightest shadow of that strange creature.

Shuo Gang originally wanted to see this strange creature and see what the difference between them and the mutant rock clan he saw in the cultivation star, but now he could only leave with a faint regret. However, he believed that he would be able to meet this strange creature, because his journey to the underworld was far from over.

Back on the ground, Shuo Gang followed the road back to Innocence City.

There were no waves along the way, and there were still more than thirty miles away, and Shuo Gang could reach the City of Innocence.

It was, however, that he found that not far away in the bushes a fierce battle was underway. The opposing side is a number of large beasts that are common on the Sin Star.

On the other side was the cold young man that Shuo Gang had seen before entering the City of Innocence. At this time, the boy's condition was very bad, and he was in danger under the attack of several wild beasts, and he could be injured at any time.

This large beast resembles a pig, but its limbs are not hooves, but rather cat's claws. Therefore, this beast is called a cat's claw pig, and when Shuo Gang and Marsa went to the underworld together, they had seen a lot, but they had already been solved by Martha without Shuo Gang's action. Cat's claw pig has a delicious meat and is one of the favorite foods of criminals on Sin Star.

Keelung was struggling to support himself, although he knew that he was likely to die today, but until the last moment, he still wouldn't give up. He was a strong-willed man, and if he hadn't been for that, he might have given up a long time ago, and the name Keelung would have long since become a thing of the past.

Keelung slammed his waist and narrowly avoided the impact of a cat's claw pig, but he lost precise control of his body because of the force, and the other cat's claw pig opened its mouth and bit his calf.

Keelung was almost certain that he would lose a leg, and after losing one, he would not be able to survive on the Sin Star.

Is it all coming to an end?

Is one's own persistence and one's own efforts destined to be in vain?

Keelung's heart was filled with a deep unwillingness, he was unwilling to die like this, and he was even more unwilling to let his deep hatred disappear like this.

However, Keelung's expected lower leg fracture did not materialize.

Oh......

As the cat's paw pig let out a terrible roar of pain, Keelung spotted a faceless black cloaked man who appeared beside him at some point.

"Thank you...... Thank you! Keelung stammered a little.

"You're welcome, you've shown me the way, so I'll repay you this time." Shuo Gang said lightly.

As he spoke, Shuo Gang shot again and again, killing the remaining five cat-claw pigs.

Then, Shuo Gang turned around and walked away towards the City of Innocence.

"Thank you, Mr. Yangshuo! My name is Keelung, and I will definitely repay you for saving your life. Keelung said loudly to Shuogang's back.

"Keelung? Oh, I remember! However, don't take it to heart. Shuo Gang turned his head and said.

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