"Is there really such a passage?"

Allen, who was on the submarine, was also shocked to see what was happening in front of him.

At first, he thought that this was just Chen Gu's speculation, even if there was a passage, Chen Gu would not have a way to open the passage.

But he never expected that Chen Gu not only found the passage, but also opened the secret passage.

This left Alan in a state of confusion.

Am I too useless, I've been in the Holy City for so long, why don't you find the key all at once?

At this time, Chen Gu returned to the submarine.

"What are you waiting for, slip away, let's go inside."

"Huh?" Alan reacted and directed the submarine to enter along the passage.

Chen Gu's submarine was not too big, and it drove down the passage for about three minutes before stopping.

"My lord, there is no road ahead."

"Then look up or down."

Chen Gu was a little speechless, Alan could obviously live in the Holy City for so long, why didn't he understand it directly at this time.

Alan reacted and drove the submarine upwards to try it out.

As a result, they soon discovered that they could actually move upwards.

Not long after the submarine went up, it came out of the water.

Chen Gu was the first to jump out of the submarine.

At this time, Chen Gu found himself in a huge karst cave.

The entire karst cave was at least as big as the Silver Pine Valley that Chen Gu had encountered.

What surprised Chen Gu the most was that in such a big place, if he had arranged the next hidden city here a long time ago.

Even if it doesn't work, you have to arrange some camps or something to ensure the safety here.

But there was nothing else in the cave except for a little light on the top of the cave, and it looked like a secret room in the dark.

Jumping to the ground, Chen Gu reached out and touched the ground.

"It's been magically manipulated here."

As Chen Gu slowly grew, his understanding of things became more comprehensive.

Now Chen Gu can know some things as soon as he stretches out his hand.

As if in front of him, the cave was obviously underwater, but Chen Gu could easily feel the dryness of the ground.

In this case, either the environment of the cave is better, or there is magic arranged here to prevent the cave from becoming wet.

As for why the environment is not good, Chen Gu can see when he looks up and knows that there is still water seeping on the ceiling.

Hearing Chen Gu say this, Alan was also a little nervous, but he quickly noticed the situation around the cave.

"My lord, is this the route to the Holy City?"

"No, it always feels like a secret room."

Chen Gu said as he walked into the cave.

Such a large cave should be used to store something, Chen Gu guessed that this might be the magic array that was originally used to store the undead natural disaster.

If some clues can be found here, it will be beneficial for Chen Gu to take the Holy City.

But Chen Gu never expected that after he took the time to go around the cave, he found nothing.

"That's not right."

Chen Gu looked at the situation here with some puzzlement and said.

At this time, Alan also persuaded on the side: "My lord, it's okay, I've been looking for islands one by one before, and sometimes I encounter such a situation, obviously I feel that there are goods, but in the end nothing comes out."

This is normal. ”

"No, something doesn't seem right."

Chen Gu turned back and walked quickly towards the way he came.

Alan didn't know what Chen Gu had discovered, so he quickly followed him again.

Chen Gu and the others quickly walked to the middle of the cave.

Chen Gu pointed to the ground and said, "Have you noticed, have you noticed, there should have been a pot here before." ”

Alan shook his head, "My lord, if you don't find it, it's okay, we can go to the next place to find it." ”

"No, there must be one here."

Chen Gu quickly thought about the things in his hand, and finally Chen Gu turned his head to Allen and said, "How much do you still have in your hands on the corpse eater, what about the holy light magma?" And how many? ”

"There are a lot of ghoul vines, and my druids will use this, but the holy light magma is gone, and all the ones left by the adults last time have already died in battle."

Although Alan didn't know what Chen Gu wanted to do, he still responded quickly.

"Then the ghoul vine, now go find ten, not fifty ghoul vines, come over, right away."

Under Chen Gu's order, Alan left immediately.

For the corpse-eating vine that Chen Gu needed, he also needed to mobilize, after all, he didn't have these with him.

After Allen left, Chen Gu sat here and touched the ground.

Although the ground here has been tidied up, and the magic array that used to prepare for the undead natural disaster is gone, the traces of filling in the ground are still left.

Chen Gu hadn't thought of it before, but now that he thinks about it, he can find that the ground here is not right.

On top of that, moisture-proof magic is also laid out here.

This is unreasonable, if it is just to destroy the magic array of the undead scourge and level the ground.

There's no need to do it so finely, and there's a magic trick out to keep it dry.

Therefore, Chen Gu guessed that there were other magic arrays under the ground.

It's just that Chen Gu can't lift this ground, he needs to ask a class like the corpse eater vine or the holy light magma to come over and help him deal with the affairs of this ground.

Soon Alan brought over the corpse-eating vine that Chen Gu needed.

Unlike the corpse eater vines in Chen Gu's hand, these corpse eaters in front of him were completely ordinary pets, with only one head and could move underground, and there was no way to compare with Chen Gu's corpse vines at all.

Fortunately, Chen Gu didn't ask them to fight.

After these corpse eaters came over, Chen Gu said to the corpse eaters: "You go underground, dig for me, and dig up the soil on the top layer." ”

As soon as they heard this, the ghoul vines sprang into action, and they quickly dug through the ground, piling large stones aside.

Alan looked at all this, and thought that Chen Gu wanted to find something underground, and he was about to step forward to persuade him, when he found Chen Gu laughing.

"Look, I'll just say yes."

Alan was also shocked, he immediately ran over, and then found that there was a thick layer of metal under the stone slab.

There are many magic patterns carved into this thick metal.

Chen Gu didn't understand this magic pattern too well, after all, he hadn't learned such advanced magic.

But I can't stand Chen Guyou.

After digging up all the stones, Chen Gu beckoned to a corpse vine.

[Necro Vine] + [Corpse Control Circle] = [??? (Success rate 1.37%)】

Looking at the synthesis formula in front of him, Chen Gu was stunned for a moment, and then he opened the description of the corpse control array and checked the details in it.