Coincidentally, there is an excellent testing site that has just been built nearby.

The ravine that was dug out.

"boom!"

After firing a shot at the ravine, Xu Xin and Zeng Tao immediately looked into the ravine that had been hit by the shot.

"Wow, this power is much stronger than an explosive crossbow bolt!"

Zeng Tao was delighted: "The cannon I made is simply too powerful!"

"This power... is really good." Xu Xin touched his chin and nodded.

More than good.

The shells fired from this huge cannon were made entirely of concentrated gunpowder and exploded upon touching the bottom of the ravine.

The roots of the World Tree that protruded from the bottom of the ravine seemed to be bitten by an invisible giant mouth at the moment of the explosion, and a large piece of it disappeared in an instant.

Then, the sound of the explosion reached their ears, and the smoke from the explosion slowly rose from the ravine.

The explosion range of this cannon is almost the same as that of an exploding crossbow arrow, but its power is visibly much stronger!

Moreover, this cannon is just a test version, and it is just a stone cannon!

If it was a purple-grade steel cannon, or even a meteorite cannon...

The power would probably be extremely great!

"Well done." Xu Xin patted Zeng Tao's head.

"Don't hit me on the head!" Zeng Tao said, but she didn't dodge. Instead, she said with a smile, "So strong, so strong! From now on, I will use my giant blade in close combat and my giant cannon in long range. I will be invincible!"

This gun is powerful, but its portability is very poor. At present, the only people who can use this gun without effort are probably Zeng Tao and Wang Lei.

Others, like Xu Xin, can lift it up, but at most they can only use it as a portable fixed mortar and cannot aim at will.

But it's not bad.

"Brother Xin! What's going on!" Wang Lei stuck his head out of his tree house not far from them and shouted over here.

The other explorers also looked over here. Wen Guixin and Zhao Xiaochuan even immediately came down from the tree house and ran over. "What happened?"

Even the ordinary survivors in the distance looked over.

At this tense moment, the sound of the huge cannon exploding immediately made them tense up.

Xu Xin quickly explained, and they all gave up and returned to their tree houses.

Taking advantage of this opportunity, Xu Xin tried to bombard several more times.

He was very surprised to find that the artillery fire could be continuous.

However, the disadvantage is that the range of the artillery fire is not very far, and 100 meters is the limit.

Because the cannon's shells are made of concentrated gunpowder, after exceeding a hundred meters, this concentrated shell will not be able to maintain its own shape, and will explode directly even if it does not hit anything.

But it’s already very good.

After all, it is a weapon that Zeng Tao can carry with him. It can be regarded as his own gun, and a range of 100 meters is enough.

"Well... I have made the cannon. Is it time for me to inject the genetic medicine?" Zeng Tao put away the cannon and looked at Xu Xin with sparkling eyes.

Xu Xin looked at the sky.

There shouldn't be any major problems tonight.

"Okay, then I'll take you there. However, Lou Fei'er and the others are not here, you..."

"Then why don't I just go to your tree house?" Zeng Tao said nonchalantly, "Isn't it just a matter of being unconscious for an hour or two and then taking a shower?"

Um……

"Okay, let's go."

…

Underground world.

The Wei family directly dispatched all military equipment and carried out a carpet search throughout the city.

Although the other two families expressed dissatisfaction with the Wei family's large-scale deployment, it was of no use.

Looking for Wei Bai, the head of the Wei family, this is a very good reason.

A huge thing.

The other two companies could not really stop them except to express their dissatisfaction.

Because the Yuan family said something extra, Wei Shishi immediately became suspicious of the Yuan family and wanted to search the Yuan family’s territory.

In the end, although there was no search, the other two families also quieted down.

Xu Ying and Li Wenxi also took this opportunity to board a helicopter and fly towards the dome of the underground world.

They want to go up there to verify their guess.

Soon, the helicopter flew to an altitude of nearly 3,000 meters and flew near the dome.

"These crystal stones are so big!" Li Wenxi exclaimed.

Seen from three thousand meters below, these crystal stones are like pebbles on a cobblestone track, one next to the other, densely and disorderly arranged.

But when you look closer, you will find that these pebble-sized crystal stones are actually as big as small houses.

Moreover, there are large gaps between these crystal stones. Although they cannot destroy the crystal stones, they can still mine and dig upwards from the gaps between the crystal stones.

According to Li Wenxi's investigation, there is a large area of ​​metal ore above.

"This is the original appearance of the crystal stone." Xu Ying explained loudly while carefully observing the dome. "This original city was built under a crystal mine. These are actually the original crystal ore."

The loud noise of the propeller forced Xu Ying to speak loudly so that Li Wenxi could hear her.

"That's actually a crystal mine?!" Li Wenxi was truly shocked this time. He immediately turned to look at Xu Ying, "That crystal city on the ground..."

"They are all made from this kind of ore. Hey, fly forward thirty meters!" Xu Ying directed the pilot of the helicopter.

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