After the weather turned cold, the number of battles on the Great Eastern Ocean Defense Line began to gradually decrease, and the Sea Clan showed signs of withdrawing its troops, which is something to look forward to. Marshal Gabriel's brow, which had been furrowed since the beginning of the war, finally relaxed. If the Sea Clan wants to withdraw its troops, it must be before the Frost Wind arrives. Otherwise, when the frost and wind arrive, the coastline will freeze and become even colder - although the sea tribe can withstand such weather, as aquatic species, they spend the winter on land, and they do not have the warm clothing like humans to maintain their body temperature, and their limbs will inevitably become stiff. This will greatly reduce their combat effectiveness and mobility, and if they continue to fight, how can humanity let go of such an opportunity? Once they withdraw their troops, they will not land again until March or April next year. Therefore, the more Marshal Gabriel looked at the gradually colder weather, the more comfortable he looked.

Of course, the same is true for the coastline south of the continent. For example, on the southern coastline of the former Inca Empire and the southern coastline of the Dayu Empire, the climate here is basically unchanged all year round, and the sea tribes have few scruples - except for the occasional three or five days of continuous high temperatures, if they leave the sea and go to land, they will be a little dehydrated and weak.

Speaking of which, it is strange that humans and the Sea Clan have been fighting for many years, but the two sides have never communicated with each other. Humans don't know who the commanders and generals of the Sea Clan are, what experiences and specialties they have, and the Sea Clan also doesn't know who the commanders and generals of the humans are and what their deeds are. Of course, the Sea Tribes still know the basic profile of humans on the continent. The Underground Race is an ally with them, and this information is naturally shared. Humans, on the other hand, know almost nothing about the underwater world. Similarly, humanity is almost ignorant of the underworld.

In this world, there are too many unknowns faced by human beings. At this point, Guderian and Natasha saw things beyond their comprehension.

In a large pit, there are numerous caves in the walls of the pit, in which ladder-like steel shelves weave back and forth to the wide ground at the bottom of the pit. On the wall of the pit, there is also a large rectangular steel elevated erection that communicates the top of the pit with the bottom of the pit. Some kobolds drove steaming steel monsters pulling seven or eight tandem bucket carts on ladder-like shelves that presumably contained some sort of ore. The rumbling in the pit was deafening and never stopped. The steel monsters pulled the ore from the hole in the pit wall to the bottom of the pit and unloaded it, and the other kobolds loaded the ore onto a cuboid elevated and transported it from the bottom to the top of the pit - the elevator, something Guderian and Natasha knew about each other. On the top of the pit, there are dense kobold camps on all sides. Countless kobolds are busy moving around the camp. Guderian and Natasha stood on a high hill about a mile from the camp, overlooking the camp and the mines.

"What are those?" Guderian asked, putting his arm around Natasha.

Natasha looked at it carefully, then used the vision spell to zoom in on the scenes of things in the mine, and hesitated, "This ...... Could it be the so-called technology mastered by the underground race that the master said?"

“...... ...... same machine that the Master had let me operate at the time of the Fusion Soul Personality?" Guderian looked down at Natasha.

Natasha looked at it carefully again, looked up and looked at Guderian and said, "It should be different, but they all belong to the category of technology that the master said." ”

Guderian looked at Natasha's delicate face and red lips, and couldn't help but lean in...... Many times later, when Natasha was almost lost in herself, she gently pushed Guderian and lay limply on Guderian's chest. The flush on Natasha's face and the misty look in her eyes made Guderian almost ...... again Ever since the two unveiled their last line of defense and reached an intimate one, such scenes have become the norm.

"Bad guy!" Natasha smacked Guderian in the chest.

Guderian restrained himself from some impulse, hugged Natasha with pity, and said, "Come on, soon we will be back on the surface." ”

"Hmm. Natasha closed her eyes happily and contentedly, enjoying Guderian's embrace.

The two of them separated after a long time, and compared to the map given by the lich.

"We seem to be lost......" Guderian said, gesturing to the map.

"This is the pit...... This is the city of Rosa...... We're right in between...... The route deviated more than a hundred miles. Natasha aligned the map with her locator and looked at it.

"You'll have to get around the pits...... Guderian said, looking up into the distance, and then continued, "This space is filled with the mines and the kobold camp...... If you want to get there, you have to go along the outside of the camp...... There are all stone walls, and the cloak should do its job. ”

Natasha also looked up into the distance and said, "Well, I'll charge the cloak first." ”

Soon after, the two of them put their cloaks on the high hill and walked hand in hand along the stone wall on the right. After putting on their cloaks, the two were immediately distorted into the background of the stone wall.

The kobold camp was filled with the roar of machinery in the pit. The kobolds were busy under the watchful eye of the Minotaur Overseers or Drow Overseers on the raised platforms set up throughout the camp. Guderian and Natasha crossed the camp along the stone wall without hindrance. But after passing through the camp, the stone walls on both sides of the space began to close and shrink, and after leaving the pit and the camp for six or seven miles, a narrow line of passage that looked like a line of heaven was only ten or so wide. Two ladder-style steel-framed rails in the passage extend from the pit to the distance. Guderian and Natasha stopped at the entrance to the passage.

"After passing through this passage and walking about twenty or thirty miles in the direction of the city of Rosa, we returned to the route marked on the map. Natasha pulled Guderian closer to the stone wall. Then, a rumbling sound came from the tunnel, and soon after, a steel monster larger than the one in the pit sped out of the tunnel, dragging dozens of giant iron boxes (steam trains) behind it.

"These steel bodies have magic arrays on them. Natasha lifted her cloak and said to the steel monster in the distance.

"It's incredible!" Guderian said as he uncovered his cloak and looked at the long dragon in the distance.

"Shall we take the opportunity to study it? Such a device is very useful for surface transportation and so on. Natasha looked back at Guderian expectantly.

Guderian hesitated, but then said, "Can we understand the principle?" ”

Natasha pondered, "We dive into the pit and look for an opportunity to dismantle the relatively small ones. I used engrams to photocopy the power structure and components, and then went back to the surface and we studied it. ”

"Good. Guderian was also curious about the dynamics of these steel monsters.

After charging the cloak, the two of them began to return the same way and infiltrate the kobold camp. There weren't many minotaurs and drow guards in the camp, and the two of them were strong and well-equipped and quickly sneaked to the edge of the elevator. After waiting for a short time, he dived into the elevator and began to descend. The guards on the side of the elevator or kobold laborers knew nothing.

After descending from the elevator to the bottom of the pit, the two infiltrated into the empty bucket box of a locomotive that was about to drive to the caves on the pit wall. This kind of crate is just enough for two people. With a rumbling sound, the Iron Monster led the two of them up the iron frame and into the mine. It took about a quarter of an hour for the locomotive to stop. Then the sound of pickaxes and hoes piercing Guderian and Natasha's ears. At the same time, the kobolds began loading ore under the scolding of a minotaur overseer.

Natasha and Guderian did not act rashly, and after the locomotive stopped, they lurked in the bucket car and observed the situation for a while, and when the kobold was about to load into the car where they were hiding, they uncovered their cloaks and jumped out.

Before the dozen kobold laborers could react, Guderian's shadow in black robes pierced the minotaur who was directing the kobold laborers to load ore on the side of the locomotive like a ghost. The Minotaur, on the other hand, did not even have a chance to roar before he slowly collapsed with frightened and incredulous eyes, and warm blood spurted out of his neck only after the Minotaur fell. It was only after the sound of the minotaur colliding with the ground as the minotaur fell that the kobold laborers realized that there was an intruder. For a moment they were about to scream in surprise, but when they opened their mouths, they were horrified to find that they couldn't make a sound on their own, and they couldn't hear ?—— Natasha had already cast a range mute. Then, there is no then.

Guderian wiped his blood-stained two-handed broadsword on the kobold's corpse and tossed it aside, then tossed the kobold corpse and the minotaur corpse into a corner. Natasha erected a noise barrier in the mine after the silence period to prevent the movement of dismantling the locomotive from spreading outside, causing unnecessary trouble.

After doing all this, the two began to observe around the locomotive. Guderian looked confused, while Natasha looked puzzled and amazed from time to time.

"Why haven't we humans thought that the steam produced by heating the water in the sealed space can also be used as a power source?" said Natasha, looking in amazement at the various devices in the front cab of the locomotive.

Guderian leaned over curiously, and only then did he understand what was going on under Natasha's instructions and explanations.

"Come on, let's take the combustion chamber apart first. Natasha began to direct Guderian to work, and at the same time took out the magic crystal and began to make memories of it.

Guderian found tools for disassembly in the locomotive and compared various structures and devices. When there are no suitable tools, they use their two-handed swords to forcibly destroy and disassemble them, and then restore and remember them through Natasha. The two of them were unconsciously busy in the mine for nearly two hours, until the abnormal carrying of this locomotive attracted the attention of the outside supervisor and sent two minotaurs to investigate, which woke them up from their busyness. And Natasha's noise barrier has long since failed, and the sound of the two clanging dismantling has long been heard in the passage. Fortunately, the two of them were alert early, and they came back to their senses when the two minotaurs approached more than thirty meters.

The results speak for themselves.

After disposing of the minotaur and looking at the scattered locomotive parts, Guderian and Natasha laughed at each other - both were covered in oil, and their faces were no exception.

"Let's go, before they notice the invasion and block the entrance, let's go. Guderian grabbed Natasha's waist.

"Hmm" Natasha walked out of the mine with Guderian in her arms, the two of them putting on their cloaks......