Vetoed two more possible ways in a row, Su Yu thought about it, and then said the last way.

"Another way is to destroy every source of pollution once, but don't kill it completely, and then clean it up one by one." To put it simply, every fragment is to fight once, but don't kill it, leave a state of residual blood, and then you can arrange for someone to stay.

Because of the residual blood, even if only one or two people are left, the mission can be completed.

It's just that the risk is still there, but the fault tolerance will be much higher than before.

From the current point of view, there are only a few methods, but each method has flaws, and all they can do is to find out that the defects are not so big among these flawed methods, or they can find ways to optimize these methods to minimize their risks.

After some discussion, they decided on the following plan: first beat each fragment of the pollution source to the residual blood, and in the process, bury the explosives and fuses, because the amount of blood of the pollution source fragments is already a little bit left, so the explosives are absolutely sufficient.

Before leaving, Su Yu will leave at least one person in each place to ensure that the explosives will not have accidents, and when all the explosives are placed and the state of each pollution source fragment is killed to the point of residual blood, the explosives will be ignited.

With the plan in hand, they simply simulated the process, and then started to act directly, because at this time, half of the time had passed since the two hours Ning Shi said, and they had no more time to consume.

"Let's hit this first." Su Yu pointed to the fragment that was close at hand, and while arranging for someone to plant explosives that hurt about 1,000, he kept an eye on the blood of the fragment at all times, in case he accidentally killed it.

If it weren't for the fear that the movement caused by the explosives would cause the bottom to collapse, Su Yu actually wanted to leave two thousand damage explosives, which would be more secure.

But there are people here, and even if the explosives don't kill them, they can make up for them.

By the time the shard's HP dropped to three digits, Su Yu had already made most of them stop, and finally only let the two warriors with only two-digit damage hit the shards with their shields again and again.

Perhaps because they didn't mean to kill the shards, there were no dark creatures to stop them.

"You two stay, and the others follow me to the next place." Su Yu named the two people to leave, and then waited for Ning Shi to make a separate barrier for them.

With this barrier, as long as they don't go out, there will definitely be no problems in the short term.

The first location was laid out, then they went to the place where the second fragment was, and then the third...... Fourth ......

Waiting until the last fragment was attacked to the point of residual blood, they lit the farthest explosive fuse in order.

Considering the different lengths of the leads, they also deliberately calculated the distance when they acted, so they knew which one to light first, and how much time to light the next one.

'Boom-' There was a small roar not far away, and then they heard a second and a third from far and near......

The last explosion sounded in their ears, and everyone stared at the location of the shards in amazement, and then they saw four black rays of light flying in their direction in the distance.

None of the others knew what was going on, only Su Yu had seen the introduction before and heard some information provided by Ning Shi, so she could guess that this should be the source of pollution that was preparing to 'escape' and was looking for an object that could be fused.

It's a pity that all the fragments of pollution sources present have been destroyed by them, and these black lights are currently in a state of 'homelessness'.

When these five black lights were scurrying around in a daze, Su Yu seemed to think of something, and immediately asked everyone to find the people scattered in the other four positions.

"It stands to reason that if the pollution sources have all been eliminated, then there should be no such black light......" Ning Shi's tone was hurried and confused.

Su Yu guessed the reason, so she explained for her, and also for the others: "I said before that there is still a fragment that has not been found, so they have not disappeared, but are looking for the location of the last fragment......"

Admittedly, it wasn't good news for them to find the last fragment and fuse it, but the current situation was that they couldn't find the last fragment of the source of pollution either.

These black lights and fragments belong to the same origin, and they must be faster than them in finding the last fragment, so Su Yu just wants to use them to find the last fragment.

As for the convergence ...... Anyway, they can't find the last fragment, so let's fuse.

After gathering as fast as they could, the few black lights in the air seemed to have found the 'organization', and they changed their previous confused and chaotic appearance, and rushed in a certain direction with a clear goal.

"Keep up!" Because of Su Yu's previous reminder, everyone guessed that they were going to follow these black lights, so the speed of action was also fast.

You chased me all the way, and those black lights seemed to feel that they were following them, but instead of wanting to get rid of Su Yu and the others, they deliberately slowed down...... It's like trying to seduce them along.

Su Yu and the others naturally discovered this, but since they had already come to this point, it was obviously impossible to stop now, so they knew that the black light was deliberate, but they still followed.

Soon, they were back to the place where they had found countless chests before.

And the five black lights 'passed through the wall' in front of them, and entered another unknown area.

"Dig." Su Yu didn't hesitate to take out the pickaxe and let everyone dig through this side.

Since these black lights can pass, it means that there is definitely another space here.

Although Su Yu suspected that there should be a better way to open this wall, although the five pollution sources on this side had all disappeared, the surrounding pollution had not dissipated much, and the pressure on Ning Shi's body was still very high, so they didn't have time to look for the mechanism at all.

Although brute-force cracking is not advisable, in extraordinary circumstances, only extraordinary means can be used.

And it turned out to be very useful, because everyone only had to dig a few picks and they already saw new pathways.

With the increase in the number of excavations, the number of people who can be accommodated through this passage has gradually increased, until when it can accommodate four or five people at the same time, Su Yu directly led people to drill over......