Ji Feng wasn't sure if that park still existed, after all, it was a memory image from more than ten years ago.

She blinked, turned her head to look at Yan Yan's position, and said in a somewhat regretful tone. "It seems that your guess is correct, Tears has been in contact with the people of the Magic Rules since she was very young, but she has forgotten how long it has been, and it is not so easy to find the person at the moment. ”

Yan Yan seemed to have expected the result of Ji Feng's inquiry about Tears, and it seemed that she had not put the breakthrough point on Tears's body herself.

She was calm about the clue that suddenly got stuck, and once again switched the holographic projection back to the layered structure of the wall of the world. "Actually, I have another plan to find the mastermind behind the scenes, and this plan is safer than what you want to find the tears in your memory, we can avoid direct contact with the tears when we were young, so that there will be no possible butterfly effect. ”

"Do you already know the whereabouts of the person behind the scenes?" Ji Feng's tone improved a few points significantly.

"Not now, it's from earlier. Yan Ling shook his head, then reached out and pointed to the hole in the light spot on the hologram. "Remember when I calculated the time of the fusion of this hole? I was also able to work backwards on these holes, and based on the aggregation of the 'primordial' elements, I was able to roughly determine when these 'primordial' elements acted on the wall of the world. ”

"And what is the result of your calculation?" Ji Feng's state at this time was like a drowning man suddenly grasping a life-saving straw.

Lance, who was sitting on the sidelines, replied suddenly. "The time was 102 years ago, and the specific location of the role was the city of Villeurbanne that we had been to before. The eldest sister should still remember, the Japanese student who led us the way at that time mentioned that the original terrain of Villepinte City was not what it is now, that the city was once razed to the ground by a huge meteorite, and the current Villeurbann City was actually built on the ruins of the future. ”

Ji Feng nodded at the same time as Li Qiang and the others, they did remember that there was such a thing.

Lance then spoke. "Astronomical technology had not yet begun to develop, and it was in the early stages of World War I, and the government simply didn't have the energy to investigate the destruction of Villepin. Even if there was a Pai Chin sent to investigate, the result was only that it was destroyed by a natural disaster, and the investigation in the depths was a complete joke. The theory of meteorite bulldozing cities was a conclusion that was popularized only after the development of astronomical technology, and the truth of this conclusion could not be confirmed at that time. ”

"So what do you mean?" Ji Feng frowned.

"Our guess is that the tragedy at that time had nothing to do with the meteorite, and the reason why the city of Villepinte was razed to the ground was because the 'primordial' element made a strong impact on the wall of the world in the city of Villepin, and then leaked a lot of energy to cause the tragedy, and the city of Villepinte was actually the first place to be affected by the destruction of the wall of the world. ”

After listening to Lance's words, everyone present except Yan Yan suddenly felt that their brains were a little bigger, this was the first time they had learned about the horror of the 'primordial' element, which could actually raze a city to the ground in an instant, and even changed the terrain and topography of this area in the future.

But Ji Feng also understood that the solution that Yan Qi and Lance wanted to show was that the risks and gains corresponded to each other.

Ji Feng glanced up at Yan Ling, who was sitting opposite him, and spoke. "I can roughly understand the other scenario you mentioned, the destruction of Villepinte is a fact that has actually happened in our timeline, and it can be traced back to a specific time period. You want to go back to the destruction of Villepinte and catch the man behind him when he used the 'primordial' element to hit the wall of the world. ”

Yan Ling and Lance nodded at the same time, and then Yan Ling spoke again. "Although we can't prevent the mastermind from colliding with the wall of the world, as long as we determine the identity of 'him', we can find out 'him' in the current timeline, and then gradually analyze the data of 'he' using the 'primary' element, maybe we can revoke or absorb the 'primordial' element on the wall of the world. ”

"So what if we don't find out, or if we don't find the mastermind behind the destruction of the wall of the world?" Li Xue, who had been silently listening to the discussion before, suddenly said an important link, and it was a link that was very likely to appear. "After all, all of our results are just inferences, and we can't be entirely sure that the man behind the scenes is hiding in the city of Villeurbanne. ”

Ji Feng touched his forehead, thinking that what Li Xue said was also a problem, after all, there are many things in this world that are unpredictable.

Yan Yan waved his hand. "If that's the case, then we'll have to do the last option, the worst of all my options. ”

"Worst-case scenario?" Everyone turned their heads to look at Yan Yan at the same time, even Lance, because he didn't even know about this so-called worst-case scenario.

Yan Yan began to explain to everyone her final plan, which was to use the strong 'primordial' elemental bomb he made to blow up all the holes in the wall of the world, and see if he could use the 'primordial' element to offset the 'primordial' element on the wall of the world. The inference that Yan Yan came up with is theoretically able to counteract it, but these two 'primary' elements of different properties may also react violently again, with about a 30% chance that the 'primordial' element on the hole will continue to spread, and a 70% chance of being able to cancel out the 'primordial' element on the wall of the world, which can be said to be a not too bad plan.

But the most important point of this plan is that the Primordial Elemental Bomb must be detonated from the other side of the hole, that is, from another parallel universe. Because this is the only way to avoid spreading to other holes in the wall of the world here. And in this way, the people who set up the 'primordial' bomb will not be able to return to this side of the universe. At least for a short time, they can't come back, even if the people over there reopen the wall of the world, they can only lead to other parallel universes, after all, the number of individuals in parallel universes is too huge, and Yan Yan can't accurately locate a parallel universe at this time. No matter what kind of electronic instrument or magic object it is, as long as it crosses the wall of the world, it is basically equivalent to an airplane after losing contact.

After listening to Yan Yan's explanation, Ji Feng sighed that this was indeed the final plan and the worst plan.

In the end, everyone decided to start with the city of Villebain 102 years ago, after all, this is the most reliable and safest of all the plans. However, the number of perfect black box machines that Yan Cheng has made so far is too small to support everyone to cross together, so Ji Feng gave Yan Yan three days to rush to work overnight to make all the remaining black box machines.

Although Ji Feng also knew that it would be very difficult to rush out a few Heihe machines within three days, Yan Ling said that the design drawings of the black box machines had been completed, and the manufacturing speed could be greatly improved, as long as everyone came here to help in the past three days, strictly speaking, there would be no problem.