Ye Feng had used his spiritual power to explore the underground before, but he didn't gain anything, and before the corpse tide broke out, these zombie rats may not have started their official actions, so it was difficult to use spiritual power to detect something.

But now, according to Ye Feng's estimate, these zombie rats should have already taken action, and with his spiritual power breaking through to the fifth order and increasing the scope of exploration, he may be able to find any clues.

With the exploration of spiritual power, the scene below the ground clearly appeared in Ye Feng's mind.

Countless rats are digging tunnels together, and at this time, there are already dense tunnels on the ground ten meters below the base, and the number is so huge and complex that it is like depicting all the county-level roads on a national map, and people are dazzled to see it.

Ye Feng was sure that if an ordinary person was put in, it was estimated that the other party would be trapped for two or three days, and he might not be able to get out of such a complicated tunnel.

These zombie rats, relying on these tunnels, are moving quickly, and it doesn't take long to go anywhere in the base to attack.

And if you look closely, you can also find that although these tunnels look very complicated at a glance, they are unusually evenly distributed, and the attacks of these zombie rats are also evenly scattered everywhere, not in a place where there are many people, so the degree of attack will be increased, and the number of people will be reduced.

If there are people who understand military affairs here, as long as they analyze it carefully, they can come to a conclusion that these zombie rats are only harassing to the greatest extent, and they don't really want to use sneak attacks to achieve any purpose.

To put it simply, these zombie rats, making such a massive attack, are likely to be just a cover for the ultimate goal.

However, after Ye Feng "saw" all this with his spiritual power, his expression was quite calm, because he had already seen these situations a few days ago. If this is not the case, how could he attach so much importance to these zombie rats, the commander behind these zombie rats is definitely very ambitious.

However, with the investigation, Ye Feng's face gradually became a little ugly, after his spiritual power broke through to the fifth order, he could easily probe any move within a radius of five hundred meters, and the detection was also clearer.

However, even so, he still didn't find anything, except for the number of these zombie rats and tunnels, which were almost no different from the attack a few days ago.

Just as Ye Feng was frowning and pondering, suddenly there was a strong vibration in his spiritual exploration.

Feeling this vibration, Ye Feng's heart moved slightly, and then he controlled his spiritual power and probed in a straight line towards the source of the vibration.

Ye Feng's spiritual power, directly released to investigate, can probe all the situation within 500 meters of his center, and this range is in a circle, and Ye Feng is that circle.

But if you forcibly control your mental power and only probe in one direction, then this distance can be more than doubled, that is, it has reached a range of one thousand meters.

Therefore, Ye Feng was able to find at once that on the side of the coalition headquarters, a huge instrument had been activated, and a huge metal plate and several metal pillars stretched out from under it, clasping tightly to the ground, and then began to vibrate at the same frequency.

As the instrument vibrate, the underground passages within 30 meters around it began to collapse.

The underground passage is collapsing, and the instrument is slowly moving, and the dense passages dug by the zombie rats underground are constantly being wiped out along the way.

In addition, in several other directions, nine identical instruments appeared, moving together.

After using his spiritual power to detect all this, Ye Feng knew that the seismograph on the side of the coalition army should have been modified, and judging from the current situation, the efficiency was still very high.

Based on the current situation, a slight extrapolation can be judged that if the ten instruments work together, it will only take 20 minutes at most to walk around the base and collapse all the passages dug by these zombie rats.

Although these zombie rats will also continue to dig tunnels, with the presence of these ten seismographs, their digging speed will become turtle speed, and the excavated passages will soon collapse again, and they cannot be reused.

In such a situation, the effectiveness of their sneak attacks will be greatly reduced, and they will no longer pose any threat to the coalition forces.

It can be said that the plan to modify the seismograph to curb the attack of these zombie rats is quite smooth in the current situation.

Seeing such a situation, Ye Feng also chose to wait patiently, he also wanted to see what kind of way the commander behind the zombie rat would take to deal with such a situation, maybe he would be able to spy on what the other party's plan was through this way of response.

While Ye Feng waited patiently, 20 minutes passed quickly, and the ten seismographs were the same as Ye Feng's judgment, they had already walked around the base, and all the original passages had collapsed.

Although the zombie rats below are still digging tunnels, the ten seismographs on the ground are also constantly running, still collapsing the newly dug passages everywhere.

Under such circumstances, the frequency of those zombie rat attacks is less than one-tenth of what it used to be.

If the average soldier used to be attacked by zombie rats every two or three minutes, so he couldn't rest. Now this time will be extended to twenty or thirty minutes, and if several people are together and one person is separated to protect them, then they can squint for a while.

The change in the situation in the field also made the soldiers in the base cheer excitedly.

And as time goes by, the sun rises higher and higher, the sun becomes more and more intense, and those zombie animals that are still attacking, the speed of attack has slowed down greatly, and even the bird zombies are scattering.

It's all going in a good direction, and all the soldiers in the base have smiles on their faces.

Such a tough battle gave these soldiers a sense of belonging to the coalition forces, and knew that only when their bases were united could mankind truly survive in this apocalypse.

The soldiers of the entire base are in high spirits and with smiles on their faces, and it can be said that everything is going for the better.

But only Ye Feng, who was sitting in the tent, did not slow down in any way because of all this happening, and even frowned even tighter.

Because he found that even though these zombie rats were contained, the commander behind the scenes did not make any adjustments, as if it didn't matter whether these zombie rats attacked successfully or not.

In addition, Ye Feng also discovered that compared to when he first returned to the base, the danger he perceived from the ground now was already a little stronger than before.

Obviously, the plans of these zombie rats have not stopped, and they are even going on, and they are getting closer and closer to success.

(End of chapter)