Blood Pupil put down the Human Demon Heart Method in his hand, turned his gaze, and looked at the paper in Li Yi'an's hand.

I don't know what material the paper is made of, it is unusually thin and light, and it has almost no weight.

But it has been folded so many times that at a rough glance, a very small 'secret' character can be faintly seen on the outermost side.

As Li Yi'an slowly opened it, the originally palm-sized paper was completely spread out, and it could cover half of his body.

At the top of the paper are four large letters.

'Tunnel Zero!'

The rest of the content is almost entirely made up of lines, which makes your scalp tingle to look at.

A crooked line the thickness of a finger runs through it like a trunk.

The rest of the lines are slightly thinner, all connected from the main trunk, twisting and turning, some long and some short, like the direction of an underground tunnel.

And on top of these lines, there are a large number of lines spreading, like the roots of ancient trees, constantly extending into the ground...

There is no doubt that this is a detailed route map of the main and side roads of Tunnel Zero.

A large amount of text is also marked at the end of each branch node, including the tunnel number, depth...

Words such as curses, types of underground monsters, types of herbs, ore attributes, etc., are constantly repeated.

I didn't pay attention to it before, but now I think back to the memories of Fan Bo and Liu Ming.

In their memories, there are a lot of images and dialogues from Tunnel Zero.

Because the task that the two of them took on back then was the task of Tunnel Zero.

The three tunnel exploration missions that Fan Bo took on were also Tunnel Zero.

The information obtained by the two of them after superimposing their memories, the current drawings and keys, and the riot of the prisoners all seem to point to... Tunnel Zero.

...

Tunnel Zero, the earliest tunnel excavated in the mine.

At the beginning of the excavation, the mine used a large number of prisoners and demon clans, and used many techniques to explore, develop, and strengthen it.

The area it has really explored, the depth of its development, has long been unknown.

Oddly enough, although there has been a mission for the tunnel in the later period.

But the tunnel was abruptly sealed three years ago and no one is allowed to enter or leave the tunnel.

Since then, the release of tasks related to Tunnel Zero has been completely discontinued.

Not only the tunnel exploration task, the collection task, is nowhere to be seen, but even the task of daily tunnel maintenance no longer appears.

The tunnel appears to have been completely abandoned by demons.

There are even rumors that the top management plans to use blasting and landfill to completely abolish Tunnel Zero, but there is no follow-up.

Since then, Tunnel Zero has become one of the forbidden places in the mine.

The word 'secret' that Li Yi'an had glimpsed earlier appeared in two branches.

One of them is called Eighteenth Branch, and the other is Forty-Six.

There is no doubt that the secret realm of the mine that Liu Min explored is here.

Li Yi'an couldn't help laughing at himself.

For Fan Bo, the human demon heart method is a dead end, and the wooden box represents a life path.

So why put the dead end in the life path?

It turns out that the key, the paper, these two things together, is the real way to live!

The human demon mind method is just a skin.

However, there is still no clue about what the two keys and two secret realms refer to.

"Why can't you think about it and erase your memories?"

"Didn't he know that losing his memory would make a person stupid?"

...

Blood Hitomi snickered and didn't speak, as if it was also a pleasure to look at her master's distressed appearance.

Still, some useful information has been gathered.

Investigate the direction of the mine secret realm, Chu Keren!

Li Yi'an, who knew Chu Keren's true strength, would definitely not investigate Chu Keren at such a critical moment.

The purpose of the walker leaving the mine was to find the Chu Keren.

Before leaving, he also put in the sentry in the forest.

Li Yi'an would not think that Chu Keren's residence would be unguarded.

Therefore, the priority is to investigate Tunnel Zero at this time.

Find out what happened to Fan Bo in Tunnel Zero back then?

Why did the prisoners riot?

Li Yi'an said softly: "Let's start the investigation from the secret realm of the mine first!"

Since it can be called a way of life by Fan Bo, its value may not be lower than that of Chu Keren...

"It's just... Tunnel Zero is blocked for unknown reasons, and it is very difficult to investigate..."

...

The difficulty of the investigation is really high.

Because it was Zhang Ling who blocked the tunnel, Zhang Ling's back was either a walker or a Chu Keren.

In other words, the order to block the tunnel was actually conveyed by the mastermind behind the mine.

Now Li Yi'an wants to enter Tunnel Zero reasonably as Fan Bo, which is simply a fool's dream.

Because of Fan Bo's current status and identity, he is completely ineligible to enter Tunnel Zero.

Unless tunnel zero issues the task again.

But is that possible?

The Chu Ke people are dead, and the walkers are not in the mine.

Do the current top brass have the courage to make this decision?

This is all up for debate.

Of course, there are ways to do it.

That is Zhang Ling's supervision team.

The supervision team is responsible for the normal operation of the mining area.

They can take on the task and accompany other Immortal Sect disciples into the mine.

They are also responsible for the day-to-day supervision of the mining area, including the caretaker of Tunnel Zero.

Through Chen Hao and Zhang Hu, getting close to Zhang Ling, and then mixing into the supervision team is a very good choice.

However, due to Fan Bo's identity, there are still two problems that need to be solved.

One is Zhang Ling's trust, and the other is Fan Bo's own cultivation.

The supervision team is Zhang Ling's foundation, and if he is not Zhang Ling's henchman, he has almost no hope of joining.

Chen Hao and Zhang Hu did send invitations to him and Liu Ming to go and work for Zhang Ling.

However, this could not make him directly contact Zhang Ling.

Even if there is a connection, it is not possible to gain enough trust in a short period of time.

As for how difficult it is to obtain trust, Li Yi'an knows it very well.

If it weren't for the sword questioning with the Chu madman and using the sword sect Shen Jianxin's moves, it would be impossible for the Chu madman to let down his guard.

If the Chu madman does not let down his guard, there will be no scene where the Chu madman believes in the memories of Li Yi'an's previous life.

If it weren't for this, the Chu madman would not have accepted Li Yi'an as a disciple, and Bailing would not have entered the Sword Sect.

In the days that followed, Bailing was the way for Li Yi'an and Chu Madman to gain trust with each other.

From a certain point of view, the more Chu madman loves his disciple, the more he believes in Bailing, and the more he will believe in Li Yi'an.

It's a subtle process that is very time-consuming.

Otherwise, if the Chu madman suspected that Li Yi'an was an evil cultivator, it was estimated that he would have smashed it down with a sword.

Where will he be given the opportunity to explain ...

In other words, there is a way to gain Zhang Ling's trust.

But this process is too time-consuming!

Li Yi'an can't afford it, it's really unaffordable.

The Feather Arrow Sect, the Immortal Sect led by the Royal Beast Sect, is chasing him in the Twilight Glacier.

There was also an inexplicable walker wandering outside in the mine.

Master Chu Madman came from afar and was still waiting for him outside the forest.

Not to mention, since the development of the situation, the demon clan must be trying to find a way to go south.

Tiger Dali had previously been sent by him to find the Great Demon above the Twilight Glacier.

Its purpose is to make contact with the demon clan.

He's caught in the middle, every day is a day when he can lose his head, he can't afford it, he can't afford it...

Another problem that prevented him from joining the supervision team was Fan Bo's cultivation.

The members of the supervision team, the lowest cultivation is the first order of the Transformation Source Realm, which is a hard indicator.

Although Fan Bo's identity has been upgraded to the first order on the original basis and has reached the sixth order of cultivation in the Condensing Realm, there is still a lot of gap between this and the first order of the Transformation Source Realm.

It is much more difficult to practice fraud than to trust.

Could it be that you have risen to the fourth rank in one night?

I'm afraid only a fool would believe it.

But that's not to say there aren't opportunities.

In the mine, because of the departure of the walkers, the major forces are ready to move.

This time period is the best time to settle the opponent, and both sides are short of manpower.

This is also the reason why Miao Dongqing threatened Zhang Hu and the others outside the mine, asking them to choose a side, and it is best to make the right choice.

On the other hand, Zhang Hu's invitation to Li Yi'an was also partly due to the reason.

The sixth order of the Condensation Realm is at this time period, not that there is no chance at all...

...

Of course, the above plans are relatively prudent measures to make in the internal situation of the mine.

Putting all this aside, with his own strength, there are actually two other ways to go.

Faster!More direct!But there are downsides...

First, dive directly into Tunnel Zero and give it a go.

Suppose that the highest cultivation in this mine is Zhang Ling, and the walker has no other follow-up means left.

Even if it is discovered, in terms of Li Yi'an's own strength, he has a certain ability to protect himself.

Because there is a big difference between human demons and sentinels, guards.

The former has a memory, can think, and the probability of losing control is much smaller than the latter, and the danger is also small.

Second, abandon Fanbo's identity and choose a member of the supervision team to replace him.

However, if he does, there is no doubt that Fan Bo's identity may be suspected.

Because he had just returned from a mission, even if the others in the mine would not notice Fan Bo's disappearance for the time being.

Fan Bo's friend Liu Min will also be suspicious.

...

These two paths are considered from his own strength.

It's straightforward and you don't need to rely on someone else in the mine to do it.

If he wants to, he can start acting now.

It's faster and more direct, but the downside is that the information isn't fully understood...

Through Chen Hao and Zhang Hu's contact with Zhang Ling, and then blending into the supervision team, this operation process can allow him to contact most of the Immortal Sect disciples in the mining area.

The process is very useful as opposed to information gathering.

The more information the better, but the more accurate the better.

If he directly investigates, not only will there be few channels for receiving information, but the information received will not be comprehensive.

He also needs to sort out and sift through a lot of information he has personally gathered, including but not limited to conjectures and hypotheses.

This greatly reduces the accuracy of the information.

...

Li Yi'an frowned, the way of time is short, and the collection of information is incomplete.

The long road of time is not in line with his current situation.

Although the main purpose of this trip is to grind the heartstone, the existence of humans and demons, and their purpose, cannot be ignored.

The sooner you get the information, the more helpful it will be for mid-to-late stage battles, including but not limited to the list of people who have infiltrated the Immortal Sect.

The Chu Keren are dead, and the walker is not in the mine, which is an excellent opportunity to get to know the enemy.

Give up? Impossible.

Li Yi'an included the map of Tunnel Zero in the Space Ring.

Since the human demon has blocked Tunnel Zero, then he wants to go and see what is inside!

He muttered to himself.

"Tunnel Zero, Branch Road 18, Branch Road 46, what did Fan Bo encounter back then?"

"And how do I get into it?"

"Wait for your chance, or take the initiative?"

"How much confidence can Chen Hao and Zhang Hu's invitations add to my intelligence collection?"

"Do you accept their invitation and then decide on the situation, or do you want to investigate directly, or do you change your identity?"

"The key to choosing a method is whether the dedication is proportional to the benefit of the intelligence..."

...

In a trance, the eyes of the blood pupil looking at Li Yi'an changed...

Li Yi'an thinks about things, and it seems to be very similar to that person...