At this time, Xu Xin's watch vibrated again, and it was Li Wenxi who called it.

Although it was not dawn yet, she was already going to take the large army out to mining.

"How are you doing there? I see what the Explorer said, what mechanism have you found? It won't be very dangerous, right?" Li Wenxi was slightly worried.

"Don't worry, it's safe for everyone to come down to explore this time." Xu Xin said with a smile.

"Well, then you must be careful."

Xu Xin was observing around and chatting casually with Li Wenxi.

She said that she plans to not only dig iron ore today, but also bring people to dig saltpeter ore and black gold mine.

Indeed, saltpeter is now needed to make explosive crossbows and heavy crossbows. Black gold mines are also the raw materials for universal alchemy materials, and these two ores are also indispensable.

"You are also burdened with a lot of burden. Why don't you let your beloved concubine and those two little guys help you? I don't know if they can enjoy your 100-fold explosion rate bonus." Xu Xin suggested.

"Yes!" Li Wenxi also thought of this, "Well, I'll take them to mining this time!"

My beloved mining speed is very fast, but if there is no high explosion rate, it may weaken the total output of a mineral.

However, it doesn't matter. The world is so big that Li Wenxi can also explore and make convenient things like portals. The total production of a mineral does not need to be considered at this stage.

At this stage, we should give priority to improving mining efficiency.

"Okay, I'm going to set out here too, you have to be careful."

After hanging up the voice, Xu Xin had already been around this iron room.

The smooth iron walls and floors are not cold to the touch, but instead make people feel calm and warm.

That's right, he didn't pay attention when he touched the ground just now, but now he found that the walls and floors here are actually a little warm.

About twenty degrees.

The temperature emitted on the iron plates from all directions makes the inside of this iron room warmer.

Compared with the single digit temperature outside at this time, the temperature here is more suitable.

Moreover, it is worth noting that the gap between the walls and the iron plates is not tightly matched.

Instead, there is a very tiny gap left.

This made Xu Xin slightly alert.

He knew very well what this gap was used for.

Release the red mist!

That's right, he was so embarrassed that he was climbing up and running away by the red mist released in the crack.

Since there are such gaps in this room, it means that red fog will be released here.

Lou Feier also said before that there is a faint smell of red mist here.

He couldn't smell it.

"The sixth one is found!" Lou Feier's surprise voice came over.

"Yeah!" Coco also let out a somewhat proud cry.

“Good cocoa!”

"Yeah!"

Xu Xin walked over.

At this time, Lou Feier was standing on a sinking iron brick. When she saw Xu Xin coming over, she walked out before the brick could sink.

Then, she took out a stone from her backpack and placed it on the brick, then nodded with satisfaction: "Do it! I put a stone on all the gravity mechanisms."

Xu Xin looked around.

Sure enough, a green stone was placed, including the square brick he stepped on before.

The green light emitted by these stones shows their positions in front of Xu Xin's eyes.

"Not bad...huh?" Xu Xin said lightly.

"What's wrong?" Lou Feier asked in surprise when she saw him frowning.

"The location of these gravity mechanisms seems to... symbolize something." Xu Xin observed and thought.

These six gravity mechanisms seem to form a circle at the six vertices of a hexagon at the same distance.

Xu Xin walked to the middle of these gravity mechanisms and reached out to touch the floor.

There is no prompt.

Perhaps, something will appear after the mechanism is triggered?

"Yeah?" Coco ran to him, looked at him with his head tilted, not understanding what he was doing.

Coco didn't find anything either.

It seems that he is thinking too much.

"Let's talk when they come down." Xu Xin picked up Coco, stood up, and looked at Lou Feier, "What you said, what can make you stronger, and where is the specific location?"

"Well... I feel that it should be underground... Well! It's underground." Lou Feier nodded with certainty.

Underground...

"Maybe, this mechanism is to open the passage to enter the underground?" Lou Feier guessed.

"Well, it's very likely." Xu Xin nodded.

At this time, a faint sound came from the passage, which was captured by his hearing amplification.

"They are coming down." Xu Xin came to the entrance and waited.

"Hmm? How did you know, you heard it?" Lou Feier also walked over and looked up, but couldn't see anything.

The two waited for another three or four minutes.

"Here, they are coming down!" Lou Feier kept staring at the passage, and finally saw a figure.

Soon, the first person approached here.

"You stay away!"

It is Wen Guixin's voice.

The two of them took two steps to one side, and Wen Guixin immediately jumped off from above and landed lightly.

Compared to Zeng Tao's "bang" smashing the ground, Wen Guixin, who is also highly combat-capable, is much lighter.

"Why are the others so far away from you?" Xu Xin was a little puzzled.

His ears can generally capture the position of the person behind him, and it is too far from Wen Guixin.

"Ah...um..." Wen Guixin said embarrassedly, "My toxin can be transmitted by the ladder. Wang Lei was accidentally infected just now. I gave him the antidote, so I came down alone and asked them to wait for a while before leaving."

"...It's amazing." Xu Xin's mouth twitched.

It can actually spread through the ladder!

Fortunately, it won't spread through the ground, otherwise it wouldn't work even closer to her.

"Your ability is so strong"

"By the way, where is this place? Such a long iron passage is still very tormenting and made a ladder that can only be climbed..."

Wen Guixin complained a little and looked up at the inside of the passage.

Although the people behind were far away, it only took two or three minutes.

Soon, everyone else jumped out of the passage and stepped on the floor of the iron room.

A few people came and started to look around.

Xu Xin took them to try those gravity mechanisms.

The mechanical and technological sense of gravity mechanisms made them amazed.

"Yeah?" Coco suddenly let out a puzzled cry, looked up, his little head turned, and he looked around.

"This space is really a completely enclosed iron room?" Zhao Xiaochuan looked around, "The whole room is made of iron? Even this mechanism is made of iron. Is this really iron? It looks like iron, but it always feels that it is not that simple metal. What alloy should it be?"

He reached out and touched the metal wall.

"It's very likely." Xu Xin nodded, "The passage above should be iron, after all, it's already covered with rust. But this room..."

Xu Xin looked around.

The room is surrounded by smooth metal walls, with no trace of rust.

The material of this room is obviously different from the above.

It should not be iron at all, but alloys, or a new metal.

"At this point, is there anything else to be surprised?" Wang Lei stood below the passage and pointed to the passage above his head. "A such a long passage is made of iron, so how much iron will it consume? The room below is also metal, which is not very normal... Hum? Damn it!

”
To be continued...