With our footsteps, the sound of those stone core zombies exploding gradually became clear to our ears. Finally, after turning a few big corners, we poked our head out of a truncated cave and saw the scene of underground people fighting with tens of thousands of zombies.

The cave in which we are located is a bit like a hole in the mountain wall. The stone walls on both sides are about four stories high, covered with window like caves. Those stone core zombies shook their bodies and made a whistling sound. They were chasing more than a dozen injured underground people on the channel between the two stone walls. From the shape of the rocks at the edge of the channel, the channel was opened with explosives, and pits of different depths could be seen on the stone walls on both sides, and the shallow ones were hit by bullets, Some washbasin sized are masterpieces of RPG rockets.

In the caves on both sides, hundreds of underground people leaned out their heads and listened to the sound to judge the direction of the zombies. After listening correctly, they took fist sized stones from the people behind them and hit them along the source of the sound. In the cave behind them, people under the ground can be seen carrying stones in containers. Andre and others in front of us also put on AK and opened fire on those zombies, but the number of zombies is too many, and these guns can't play a big role at all.

Ivan stared for a few seconds and asked me, "am I too stupid to see? Or are these underground monsters out of the sun for a long time? Just this stone age defense method can cause a lot of casualties to the elite of the former Soviet Union? Are you kidding?" it seems that people who have been soldiers have a stubborn plot, That is, they always think their own troops are invincible.

Andre, Ares and blood dragon were busy shooting and ignored Ivan, until the Nightingale turned around and glared at him. I said, "brother, if I'm not wrong, I'm afraid you're too stupid to see."

"You're smart enough to show me one? How can you use stones to smash modern infantry into a large number of casualties?" Ivan asked. I shook my head gently, indicating that I don't know yet, but I know in my heart that things won't be so simple. If I only know how to attack the enemy with stones, it can only be said that this can move mountains and fill the sea in prehistory, The civilization of whaling and dragon training, passing through the stars and understanding the plate energy, has degenerated too much. But it's impossible to think about it carefully. If these people were so bad, empress Yan would have ordered her men to kill them. Why take so much effort to prepare tens of thousands of self exploding zombies to attack.

I'm not the only one who has this idea. Jin Lihua nodded in agreement. San Mei looked at the mess below for a while and said, "there's something wrong with those stones."

"What's wrong with the stone? Will it bloom?" Ivan asked with puzzled eyes.

My eyes were not as good as Sanmei, so I turned the flashlight beam to the farthest, followed a few stones with a circular light spot, and stared for a long time. I found that it was really not an ordinary stone, but a silver white ore. at the same time, I also secretly guessed the fighting skills of these underground people.

When those silvery white stones were almost covered on the ground, a tall underground man emerged from the honeycomb like cave. From his wrinkled skin, he should be older than others. The underground man took out something like an oil bag and rubbed the flint with a very careful action. It can be seen that this oil bag is very precious in their eyes. After the oil bag was ignited, he held it in his hand and threw it to the hordes of stone core zombies below.

After the burning tarpaulin fell to the ground, the small white stones on the ground were quickly ignited, emitting a bright white dazzling light, and a large amount of smoke came out with the fire seedlings. Hundreds of stone core zombies walking in front caught fire one after another, and many were simply burned into coke.

"It seems that stones can really blossom, but they are sparks," I joked to Ivan. It turned out that these underground people found a large amount of high-purity magnesium ore somewhere in this stratum. Magnesium itself is a combustible metal. It is an important material for making military combustion agent and lighting combustion. The ignition point of massive magnesium is only 650 ℃, which can emit a high temperature of thousands of degrees after being ignited. If it is processed into powder, it can even be used as high-energy explosives. In addition, the complex three-dimensional cave network here provides cover for those underground people, No wonder empress Yan took so long to prepare.

Hundreds of stone core zombies in front pushed forward more than ten meters with flames like death squads, and they were all burned to the ground, shrunk into a ball, and gradually turned into black coke. I thought it was good that they didn't know the pain, otherwise this huge space must be filled with the cry of human pain.

The zombies behind ignored the experience of their "companions" and continued to move forward at a disorderly but slow and steady pace. It seems that empress Yan was damaged by us with a sky killing crossbow. After showing her true face, she was really angry and determined to kill us. She didn't know where to hide, drove the zombies away with a spell and moved towards the goal like an ant.

After the zombies in the back came up, countless underground people continued to throw silver white high-purity magnesium ore, and the wrinkled guy lit the second oil bag.

But just this time, a dark red figure suddenly flew down from the darkness above the crypt. It was Yanhou who had planned for a long time to launch an attack. It had long aimed at the crypt man responsible for setting fire in the air, rushed up and poisoned him with a tail needle. After that, the long rope like tail rolled the burned oil package and threw it into the place where the ore was stacked deep in the hole, which immediately ignited a raging fire, and dozens of underground people were burned alive in the scream.

Empress Yan's method was very effective. She only selectively attacked the people who threw the fire. Among the underground people, the fire looked very precious and rare. Every time the fire was just lit, empress Yan rushed from the air and poisoned the person holding the fire with a tail needle. Ares put down the target on the ground and tried to shoot like empress Yan, but she was too fast and had poor visibility, so she didn't have any effect after shooting for a long time. Occasionally, she shot a few shots, which didn't seem to cause any damage to empress Yan.

Taking advantage of this Kung Fu, the zombies drilled into the interior of the stone walls on both sides along some caves at the bottom of the stone wall, followed by explosions and strange screams, and then broken meat and blood flying everywhere. In the higher cave, the underground people stabbed by Yan Hou's poison needle lay on the ground and twitched for a while. They also became the kind of thing that lost all their senses. They got up again and bit their companions, or detonated themselves directly. Many underground people were blown out of the cave and fell into a large number of zombies below. After a few struggles, they were torn to pieces, and the scene was completely reversed.

"Can't hold it, retreat," ares saw that the situation was getting worse and worse, and immediately waved to Andre and the blood dragon. Andre yelled at the underground people around him with that ugly syllable we didn't understand at all. As soon as I heard the news, I remembered that when I was a child, the kitchen knife at home was blunt and couldn't cut frozen meat. My father would take the kitchen knife and grind it back and forth on the edge of the big water tank in the yard, so I decided to give this language a name, file language, which is worse than grinding a knife.

The underground people who talked with Andre opened their necks and roared with "file cavity" at the stone wall on the other side. The underground people on both sides quickly withdrew to the depths of the cave, and we followed. Some who didn't come and retreated were rushed up by the zombies and torn into pieces. Although they didn't witness it with their own eyes, other underground people still judged the fate of their own kind from their voices. There was a deep sadness in those eyes without pupils, and some young people even shed tears.

But they did not delay too long. The dark life underground not only made their skin and eyes completely white, but also taught them to be strong. These underground people quickly gathered together along the cave, and then began to run along a very wide cave in an orderly way, using both hands and feet. Although they were many, they did not appear crowded, because they could make use of the space of the cave vertically. Some people ran on the ground, some crawled upside down on the top of the cave, and even some people on both sides were using it, Moving like a gecko.

We can't hang upside down on the top of the cave like bats, and we don't have geckos. We have to follow behind honestly and take over the broken Ares and others from time to time. After all, we are now grasshoppers on a rope. If we jump together, we may have a greater chance of returning to the ground alive. In the process of intercepting the enemy in turn, I noticed that the blood dragon left the large army along a bifurcation hole and turned in with more than 50 strong and flexible underground people. Take a closer look. It's a cave we passed after climbing out of the crack we just fell down.

"Where are they going?" I asked Andre.

Andre's sad face didn't seem to want to talk too much about this topic, but simply said, "you'll know in a minute."

After winding along the cave for a long time, we followed the trend of the cave and went up a stone bridge composed of black volcanic stones. The bridge is suspended above an abyss. Looking down, we can see some dark red things flowing. The five of us looked down like a dream. No one spoke for a long time.

"What are those?" Ivan couldn't believe his eyes and said knowingly.

"Coca Cola" Jin Lihua said with a straight face and expressionless face.

As soon as I wanted to laugh, I immediately realized that she meant the "shaking coke bottle" that Andre just compared. It turned out that we were really standing on the surging lava river.

Thinking of this, I looked down again with a feeling of worship, because I know that those objects flowing slowly with high temperature are hot magma from the iron nickel core and passing through the Gutenberg discontinuity, which is the basis for the survival of all things on earth, including humans, but it is likely to erupt at the same time, The ultimate force that will eventually destroy human civilization.

After crossing several such suspended stone bridges in succession, we arrived at a place like an underground plain where we could not see the edge. In the distance, there was a flat topped pyramid standing in the dark. From the shape of the tower, there had been that kind of artificial sunlight, but I don't know when it went out, Only the endless darkness was left to the people of this ancient civilization. It's hard to imagine what supported them through the dark world for thousands of years.

After coming out of the cave and stepping on the plain, we stopped after a few steps, because the feeling under our feet told us that there was a problem with the ground here