As soon as Shen Feng heard Chu Chaoyan's suggestion, he was stunned for a moment, because at this time he suddenly thought of one thing, it seems that the method of the corpse king to control the zombies is ultrasonic, and the detector he carries is also an instrument that emits ultrasonic, so that once the zombie can hear the ultrasonic wave emitted by the instrument, doesn't it mean that everyone's location is exposed, and as long as the detector is carried, it is impossible to escape the pursuit of the zombies?

Chu Chaoyan felt strange, why did Shen Feng suddenly stop at this time, didn't he want to compete with zombies for speed? Could it be that Shen Feng is stupid?

Shen Feng put Chu Chaoyan down and said anxiously: "Hurry up and throw away all the detectors, hurry up, otherwise it will be absolutely impossible for us to escape smoothly!" ”

Shen Feng and Chu Chaoyan put the detector down, and then cut the detector in half with a sword, and the detector was immediately scrapped and could no longer emit ultrasound.

"Damn, why do I remember this now? If I had discovered this problem before, wouldn't I have encountered this danger at all? Shen Feng blamed himself very much, he knew a long time ago that the Corpse King would emit ultrasound, but he made a mistake on this issue.

Chu Chaoyan hurriedly comforted: "It's not in the way, haven't we encountered zombies yet?" Let's leave from the rest of the caves, but luckily these zombies in the tunnels have been killed by us, so there will be no danger for a while. ”

Shen Feng was silent for a moment, then suddenly turned off his flashlight and said to Chu Chaoyan: "Now we must save supplies, the flashlight can only be turned on, we can't see the road without light, and there is no way to find the road in the tunnel." ”

Shen Feng then carried Chu Chaoyan on his back and advanced in the tunnel, but at this time, he found that all the exits around him were blocked by zombies, no matter which exit Shen Feng went to, he could only find the exit blocked by earth and rocks, and it seemed that he had lost all his way back in an instant.

Chu Chaoyan guessed: "It must be the corpse king who found out that he had lost the traces of the two of us, so he simply blocked all the holes around him, planning to catch turtles in an urn!" ”

Shen Feng stopped running and sighed: "If that's what you said, then it's too troublesome, we haven't been to the farther tunnels at all, we don't know the terrain at all, it's very likely to encounter zombies, once we are entangled by zombies, we will definitely die!" ”

"Damn zombies, it's so despicable!" Chu Chaoyan couldn't help but scold, the hateful zombie was so despicable, the task of exploring the underground was a pure trap, and the two of them were now trapped underground, if they couldn't leave quickly, I was afraid that they would have to worry about their lives.

Shen Feng opened Chu Chaoyan's backpack, there were more than twenty compressed biscuits in her backpack, but there was only one bottle of drinking water left, and only five dry batteries left, so such a little material could only last underground for two days, and during this period, the two of them would also face the threat of zombies appearing at any time.

In addition to the necessary supplies in the backpack, there were several bags of salt and some notebooks, Shen Feng thought about it and threw the salt to the ground.

When Chu Chaoyan saw this scene, he hurriedly stopped: "Don't throw it, I rely on these salts to cast my abilities, if you throw it away, what kind of abilities do I use!" ”

Shen Feng shook his head helplessly, and said: "We don't have much drinking water, and your ability can only produce chlorine gas from water, if you cast your ability, it will inevitably consume drinking water, and we will die of thirst when the time comes, don't worry, now I will protect you and won't let you get hurt." ”

When Chu Chaoyan heard this explanation, she could only put down the salt helplessly, she was thinking at this time, it would be good if the battle took place on the seaside, with her own ability, she would definitely be able to summon a piece of chlorine gas with a wave of her hand, and no matter how many enemies there were, she could destroy it. But what Shen Feng said also made sense, if you need to consume drinking water, your ability will not have room to play.

"Well, it's all up to you!" Chu Chaoyan said helplessly.

The reason why salt is needed by human beings is because human beings need to supplement sodium ions from table salt, but the supplement of sodium ions is also within a certain range, once the sodium ion intake is excessive, it is easy to lead to hypertension type diseases, and a large amount of sodium ions in a short period of time will lead to an increase in osmotic pressure in the human body, and it will become particularly thirsty and especially need to drink water.

As for the water left after Chu Chaoyan made the poison gas, it was all sodium ions in it, and anyone who drank it would be thirsty, and they couldn't use it at all.

Therefore, Shen Feng weighed it and threw it away, this thing is not important, human beings will only get sick if they don't consume salt for a long time, and there will be no problem if they don't consume salt for a short time, instead of putting it in a backpack to add weight, it's better to increase their speed after throwing it away.

Shen Feng and Chu Chaoyan sat in the tunnel and began to rest, Shen Feng planned to go to the unknown tunnel in the distance to find the exit, it is impossible for all the exits to be blocked, there must be a cave in the distance that can be left, the only problem is that it is easy to encounter zombies on the way to these exits, once it is besieged by zombies, then it will be difficult to get out.

Chu Chaoyan was more optimistic, she thought that Lu Xian would definitely come to the rescue with reinforcements, as long as he found that he and Shen Feng had not appeared, he would definitely return to Yanjing to ask for help, so as long as he could hold on until the reinforcements appeared, he would be saved.

Shen Feng touched the two long swords on his waist, he knew that this was the only thing he could rely on now, as long as the long swords were still in his hands, it was impossible for him to be killed by zombies.

Shen Feng and Chu Chaoyan didn't rest for too long, the ground suddenly shook slightly, the two of them immediately became vigilant, there was a roar from both ends of the tunnel, accompanied by the roar and the sound of hurried footsteps, zombies appeared at both ends of the tunnel, these zombies were hurrying, bringing up countless dust in the tunnel.

Shen Feng hurriedly said to Chu Chaoyan: "Come and put on my back, bring your backpack!" ”

Chu Chaoyan took out two daggers from his body and said seriously: "I can also fight." ”

"I'm not going to fight, I'm going to run away with you, fighting these zombies will only consume your physical strength in vain, hurry up!" Shen Feng said.

Shen Feng bent down in front of Chu Chaoyan, Chu Chaoyan hurriedly lay on Shen Feng's back, and his legs were also sandwiched between Shen Feng's waist, so that Chu Chaoyan could stay firmly on Shen Feng's back, at this moment, Shen Feng chose a direction and rushed out, and the two swords kept swinging, and finally killed a bloody path.

Shen Feng wanted to increase his speed to the extreme, but the tunnel was really narrow, as long as he advanced, it would be difficult to avoid encountering zombies, and the speed could not really be fast, so he could only advance while slashing and killing until he penetrated the tunnel blocked by zombies.

Fortunately, after Shen Feng became a fourth-order ability, the strength of his body could not be exhausted, so Shen Feng did not feel exhausted in a short period of time, and he also carried Chu Chaoyan towards the unfamiliar tunnel, since all the tunnels he was familiar with were blocked, then he could only move in an unknown direction, if God blessed, he must be able to find a new exit.

Shen Feng struggled forward with such an idea, the zombies in the tunnel seemed to appear endlessly, killing one and rushing up ten, in this case, Shen Feng could only cheer up and move forward under the huge pressure brought by the zombies, but fortunately, Chu Chaoyan could help Shen Feng share part of the pressure, which allowed Shen Feng to move forward.

Unconsciously, Shen Feng killed thousands of zombies, and at this moment he also felt tired, in the narrow tunnel, the zombies rushed up in line, as if they were queuing up to die, but in fact, these zombies were just cannon fodder that consumed Shen Feng's physical strength, no matter how many people died, the corpse king would not be distressed.

The hard work paid off, Shen Feng saw a hole leading to the ground appear in the distance, and after a closer look, the hole was not blocked, which showed that the hope of leaving the ground appeared, as long as he could leave from here, then he would be able to survive.

"Chaoyan, hold on, we can survive as long as we rush over!" Shen Feng hurriedly said to Chu Chaoyan.

Chu Chaoyan lay on Shen Feng's back and kept wielding the dagger to kill the zombies in front of her, she was also relieved at this time, and echoed: "It's only a dozen meters away, as long as we rush over, we will be safe, I will hold on." ”

Now that the opportunity to leave the tunnel appeared in front of them, Shen Feng and Chu Chaoyan had to cheer up, they were only one kick away from escaping, and the opportunity was in their own hands, if this kick was still crooked, wouldn't it be too much to regret?

However, at this time, the tunnel began to shake, Shen Feng and the zombies around him were all unstable, and the surrounding earth and stone walls were also shaking, as if they would collapse at any time.

"Could it be an earthquake?" Chu Chaoyan hurriedly asked.

Before Shen Feng could answer, the ground began to collapse instantly, this section of the tunnel fell downward, Shen Feng and countless zombies also fell, no one expected that there was still space below, and Shen Feng finally failed to leave the ground from the newly found exit.

"Boom ......", in the collapse of the ground, Shen Feng and Chu Chaoyan fell, and there were many zombies who fell together, in the darkness, Chu Chaoyan's flashlight stopped glowing, and at this point, the entire tunnel fell into darkness.

…………

After Lu Xian left the tunnel, he couldn't wait for anyone to appear, and he couldn't see Shen Feng's figure on the right, he couldn't help but go to the caves that had been explored around, but he found that these holes were all blocked, and he panicked immediately, it seemed that the city lord and Chu Chaoyan were trapped below, and the cave entrance was now blocked, and he wanted to rescue the two but didn't know where they were now.

"No, I have to go back and ask for help, my own strength is still too weak, only by finding a helper can I rescue the city lord!" Lu Xian thought about it, there was only one way to ask for help, and whether it was Guo Pinming or Yang Chang, both of them were superpowers, and with their help, he would have more confidence on his side.

Lu Xian figured this out and hurriedly ran in the direction of Yanjing, but before leaving, he also put his backpack outside a hole, if the city lord dug out of the ground, he could get a little supplies.

After returning to Yanjing, Lu Xian quickly found Yang Chang and Guo Pinming and explained what happened today, but at this time it was close to dusk, and it was about to get dark, and now it was not a good time to set off to rescue, and more importantly, it was not good for them to leave their posts without permission, and before Shen Feng left, they had also told the two to guard the city wall.

However, Guo Pinming had an idea at this time, and he said seriously to Lu Xian: "You go and contact Xiao Sheng of the Ability Management Bureau now, he is the boyfriend of the city lord's sister, and he will definitely not die now, you let him help, in addition, I will also set off tomorrow morning, and the city wall will be handed over to Yang Chang!" ”

Yang Chang originally wanted to rescue Shen Feng, after all, he was picked up by Shen Feng, and now it is definitely appropriate to search and rescue Shen Feng at this time, but he can only stay in Yanjing, if he also leaves, the five thousand people under his command will completely lose their restraint, and the matter of saving people can only be handed over to Guo Pinming.

Yang Chang glanced at Guo Pinming deeply, and said seriously: "Old Guo, everything is handed over to you, the city lord must return safely, otherwise, how can we still have the face to go back to see the deputy city lord?" ”

Guo Pinming nodded seriously, he understood what Yang Chang meant, thinking that he didn't listen to the orders of the city lord at the beginning, and attacked without authorization, which eventually led to the annihilation of a thousand soldiers, and in the end, Shen Feng also ignored his previous suspicions, let himself go to the south to buy medicines, and use the task to atone for his crimes.

And now he also needs to repay Shen Feng, since the time of Jiangyang, he has always been taken care of by Shen Feng, if this kind of kindness is not reciprocated, it is ungrateful, and Yang Chang can't leave Yanjing, the rescue mission is on his own body!

Lu Xian didn't have time to say anything, he turned around and went to look for Xiao Sheng, now only Xiao Sheng can participate in the rescue, he is a genius of the Abnormal Energy Administration, and he has many friends, if he is willing to help now, he must be able to play a huge role.