Song Ziyu looked back, and with the help of the faint night vision, he saw that on the wall of the section of the road where he was fighting just now in the dark, there were gravel falling.

This......

All of a sudden, the reinforced concrete wall had a big hole.

With a large amount of earth and stones falling like rain, Song Ziyu's whole person was not good.

You know, this is a subway tunnel!

The shield process and construction standards are extremely strict, and the pressure standards are also first-class!

Otherwise, it would not have been possible to dig such a huge space 100 meters underground.

But such a solid and stressful tunnel was broken by something!

Song Ziyu's eyes widened, and his face was full of incredulity.

A large, rounded head like a drill bit emerged from the hard reinforced concrete wall.

From a visual point of view alone, the diameter of this huge head is one or two meters, and when it comes to physique, it is definitely a proper beast of the wilderness.

"Don't move, don't speak, don't move, don't talk." Ah Fa was unprecedentedly nervous, and grabbed Song Ziyu and pressed himself into the corner of the railway.

The two pressed their bodies against the wall, not daring to make any sound.

The giant monster doesn't seem to find itself.

After the skull broke through the wall, it stared at the wall on the other side of the tunnel!

I saw it squirm its terrifying body, and its mouthparts were swallowed, revealing a circle of slender wheel teeth.

The teeth are spinning wildly, like a large TBM with plenty of power and oil, and is digging the tunnel at full speed.

…… This large-scale burrowing scene show also lasted for an unknown amount of time, and as a large amount of earth was excavated, the bodies of terrifying monsters began to emerge gradually.

Song Ziyu finally got to see the whole picture.

It is a huge worm with a body length of at least several hundred meters.

Judging from the characteristics of the body and the characteristics of digging into the ground, Song Ziyu was almost certain that this thing was a mutated and disordered earthworm.

Earthworms, also known as earth dragons.

Song Ziyu used to think that it was the ridicule of the ancients, but now that I see it, I know that the ancients did not deceive me.

Such a huge earthworm, dried durian-flavored earthworms, should be enough for Liu Peijia's family to eat for half a year...... Song Ziyu swept away the messy thoughts in his mind and quickly analyzed the characteristics of this monster.

First of all, the Children's Encyclopedia will tell you that earthworms don't have eyes!

This monster doesn't rely on eyes to perceive in the dark!

But the monster's epidermis is extremely rich in sensory cells, which can sense slight sensitive vibrations, and can confirm the direction according to geopolitical vibrations, and at the same time, there are also a large number of light-sensing cells in these cells, which can capture a small light source in the dark.

This monster uses this way to capture its prey, and this monster also has a characteristic of killing himself: this girl is not picky, and whoever is caught eats whomever is eaten, and the soil is also eaten.

In the face of such a monster, absolute silence is definitely a wise way to save your life.

So Song Ziyu squatted against the wall, squatted and fell asleep.

……

I don't know how long it took, but Song Ziyu woke up in a daze, and the big earthworm had already disappeared.

After making sure that the thing had gone far enough, Ah Fa began to move his squatting numb legs.

"I can't see that you kid is still so clever!"

Ah Fa teased.

Song Ziyu smiled bitterly: "How can I say that I have also had survival experience in the world of the Doomsday Wasteland, don't underestimate me too much." ”

"That's good, that's good, let's keep going." Ah Fa said.

The two continued along the track.

Finally, after passing through a dozen stations and refugee toilets, the two turned into Metro Line 2.

After entering Metro Line 2, the surrounding environment suddenly became bad!

From time to time, zombies appear along the way, attacking themselves in the dark.

However, Song Ziyu and Ah Fa are not ordinary people, and these zombies that have not evolved have no substantial lethality for the two.

But that doesn't mean these monsters can't harm other civilians.

Therefore, all the zombies that passed along the way, Song Ziyu swept away.

In this way, the zombies were slaughtered as they went, and all the seven or eight stations they passed through had been abandoned, and several settlements had been destroyed.

"Where did these zombies come from?"

The closer he got to the West Rail District, the more tired Song Ziyu became from killing zombies!

These zombies seem to be unable to be killed, and there are several passages full of corpses, and no one has contained them, which is simply a stench to the extreme.

Ah Fa explained: "Line 2 is located under the most prosperous new city in the northern capital, and every exit directly faces the downtown streets, and the depth of the subway entrance here is not as deep as Line 3. ”

"When the Northern Capital built Metro Line 3, the depth was built according to the level of temporary shelters."

"Therefore, it is completely easy for zombies cruising above the surface to enter the second underground line."

"What then?" Song Ziyu couldn't help but ask.

Zombies enter in such a steady stream, it is very fatal, you can be a thief for a thousand days, and you can't prevent thieves the day before yesterday, and zombies enter the underground with the entrance of the earth every day, which is really fatal.

"What else can I do? Of course, it's a cold salad. ”

Ah Fa said with a sigh.

Song Ziyu said from his own point of view: "Defenses should be built at the entrances of each subway station, so that they can resist the invasion of zombies." ”

"You're so smart." Ah Fa laughed: "The solution is not something that you alone will think of, but your solution may not be useful." ”

"Why?" Song Ziyu straightened his head like a goose.

Ah Fa said lightly: "Do you know where these zombies are terrifying?" ”

Song Ziyu shook his head blankly.

Ah Fa said: "The most terrifying thing about these zombies is not that they can eat people, nor their fangs and claws, but that they have strong radiation on their bodies!" ”

"Radiation can't kill zombies, but it can infect humans in the entire subway station with zombies."

Ah Fa sighed: "You see that most of these human beings who have mutated due to infection are here because of this. ”

Song Ziyu suddenly realized when he heard this.

"So, building a barrier against zombies is not as simple as you think, if you are close to the subway station, the more radiation damage ordinary people will suffer. In this environment, let alone building defensive works, even if you stay for a long time, you can't continue your life. ”

Ah Fa explained.

"I ...... Seems to understand! ”

Song Ziyu sighed.

I made an empirical mistake, that is, I always like to think about other people's things from my own point of view, and point fingers at others from the perspective of nothingness.

It's like a group of people who are struggling to get a primary school degree want to talk about the scientists who made the space shuttle atomic bomb.

It's stupid to not know it.

"Let's keep going, the West Rail District is almost there." Ah Fa said.

So the two of them slashed all the way and advanced towards the West Rail District.

……

Wei Kai led people to stick to the 2741 subway section, and won and ran out of bullets in his hands.

The battle was just too intense!

I don't know why, there are so many zombies today!

"Give me a box of bullets! I need help! Wei Kai called out to his companion.

However, no one had time to respond to themselves!

Wei Kai looked around, and in the dim light, all he saw were his comrades who were fighting bloodily.

The improvised iron fence set up on the subway corridor is crumbling, countless zombies are stretching out their heads and hands to scratch in the air, and some unlucky companions are even caught by zombies and gnawed.

Wei Kai felt despair in his heart.

It doesn't matter if you die, but the enemy breaks through this line of defense and will enter the core area of the West Rail Vault.

There, hundreds of thousands of survivors will be targeted for zombie slaughter.

Behold, I have a city in the last days.