Yu Wei carried the gun on his back and kept crawling up.

More and more zombies are pouring into the defense circle below. Under the cover of ordinary zombies, some wall-climbing zombies also appear.

A wall-climbing zombie jumped up, was illuminated by ultraviolet light in mid-air, let out a shrill scream, and then fell back into the zombie group.

Soon, Yu Wei climbed up.

call--

Panting heavily, he watched Cao Le and the others put the rope ladder up.

Buzz buzz——

After seeing them all coming up, Lao Bi quickly controlled the helicopter to return to the headquarters base.

They have been waiting here the longest. There are fixed numbers for how long the helicopter can fly and how far it can fly.

There is still 20% fuel left, which is enough to return to the headquarters base.

But he didn't relax completely.

"Qu Xing, check them to see if they are infected by zombies."

This place is too sinister, so you must be careful.

Although among all the zombies they have encountered in the past, they will mutate within three minutes after being bitten.

But this place is unusual, so many mutant zombies suddenly appeared.

Have to guard against it.

Qu Xing unbuckled his seat belt and went over to inspect Yu Wei and the others in person.

After discovering that they were not bitten, Qu Xing returned to the passenger seat.

And when he finished checking, the helicopter was almost there.

After all, it's only fifty kilometers, and with electronic beacon navigation, all you need to do is fly the helicopter to a certain height and fly as fast as possible.

It doesn't have to be as troublesome as when you came here.

Fifty kilometers is only ten minutes for a helicopter that can reach a speed of 300 kilometers per hour.

The combat personnel in the other three helicopters also inspected those who boarded the helicopter.

This is to prevent anyone from being bitten by zombies and bringing them back to the base, causing trouble.

When they went out at night, they went to a somewhat strange place, so they did not land in the outer city, but in the Wengcheng of the first outer city.

Buzz buzz——

When Lao Bi parked the helicopter in the first outer urn, he saw through the windshield a circle of combatants already standing outside.

Lao Luo and others who returned to the headquarters base before him were screened for the second time by He Chao and others.

"Lao Bi and the others are back too." After completing the screening, Lao Luo stood next to Li Yu and said to him.

"Bai Jie and the others are also in that helicopter."

"Um."

Just now, he had learned something about the situation in Hefeng Town from Lao Luo and the others.

How could a remote mine have so many zombies?

Li Yu waited patiently. It was almost 4:30 in the morning.

He has been waiting, waiting for Lao Luo and the others to come back.

After all, the second uncle is old, so he keeps beating Hache.

After Bai Jie and others completed the inspection, Li Yu immediately asked Lao Bi, Bai Jie and others to come over.

"Did you find any reason?" Li Yu asked quickly.

Hefeng Town is only more than fifty kilometers away from the headquarters base and only a dozen kilometers away from the fifth satellite city.

With such a close distance, if it rains heavily, the zombies over there will definitely come over.

Even in normal times, when cooperators are doing tasks in the surrounding areas, they are prone to encounter these groups of zombies.

That is extremely dangerous.

Hidden dangers must be clarified and resolved!

"There's a huge cave over there!"

After hearing Li Yu's question, Lao Bi continued:

"It's two kilometers behind the mine, in a forest behind it. The cave looks quite big. The zombies that surrounded Yu Wei and the others came out from there."

"Cave?"

Li Yu frowned. He knew Hefeng Town, but he didn't know much about it.

"Which of you is from Hefeng Town? Does anyone know about this cave?"

He Chao quickly raised his hand and said:

"I'm from Hefeng Town. I know that place. It's actually an underground cave. It's very deep. I used to go there often when I was a kid."

"Cave? Isn't it a cave?" Li Yu asked.

"No, that's a cave. Before the end of the world, the local township government heard that they were planning to develop it into a tourist attraction, but because it was too remote, they were afraid that no one would invest and the revenue would be too high, so they kept shelving it."

"I went there when I was a kid. It was used as a command post during the Anti-Japanese War. There are still some ruins inside."

"Hmm...how big is that cave?"

"It's quite big. After entering from the cave entrance, it should be two kilometers long from the largest entrance to the innermost part, but I really can't say exactly how big it is.

Because there are many forks in the cave, each of which is different in length, I used to play peek-a-boo with my friends when I was a kid."

He Chao is already in his thirties, and it feels a little strange to hear him say the word "hide and seek".

Everyone continued to listen to him.

He Chao's eyes showed memories.

"There is one thing that particularly impressed me. I remember one time when we were playing hide-and-seek, someone was hiding and couldn't be found. We looked everywhere and couldn't find him, and then he was still shouting inside.

Later, the entire village was mobilized to search for it, and they searched all night long.

I didn’t find it until noon the next day.”

"When I found that little friend, he was already dead. He accidentally fell into the underground river and drowned. When I saw it, the body was swollen."

"I haven't been there since."

"There were white snakes and bats there, as well as black ones. When I think about it now, I feel how brave I was at that time!"

The second uncle was a little sleepy at first, but after hearing what He Chao said, he became much more energetic.

"Underground river? Is there an underground river in that place?"

"Yes, that's a cave. The entire path goes downhill. There are many stalactites in it. A homeless man once lived in it, but he was all dead when he was discovered."

"Why? How did he die?" the second uncle asked.

"I heard that he was poisoned by a snake. The venomous snake inside was white. Some people said they saw a white one with a big head inside."

"Isn't that a python!?"

"I haven't seen it, it's just hearsay."

After hearing this, Li Yu frowned.

Two kilometers in length...

"How wide is the largest hole?" Li Yu asked.

"Forty to fifty meters, the widest one is hundreds of meters, very big." He Chao replied.

"Um...."

Such a large cave is underground and has an underground river.

It's dark and damp, which is very suitable for zombies to survive.

"Do you know where the underground river leads to?"

"Well, I really don't know..." He Chao was a little embarrassed and shook his head.

.....
Chapter completed!