Shen Feng was stunned on the spot upon hearing Chu Chaoyan's suggestion. He suddenly remembered that the corpse king's method of controlling zombies was ultrasonic waves, and the detector he carried also emitted ultrasonic waves. If the zombies could hear the ultrasonic waves from the instrument, wouldn't everyone's location be exposed? It would be impossible to escape the zombies' pursuit if they carried the detector.
Chu Chaoyan found it strange. Why did Shen Feng suddenly stop at this moment? Wasn't he going to race against the zombies? Had Shen Feng gone mad?
Shen Feng put Chu Chaoyan down and said anxiously, "Quickly throw away the detectors, hurry, otherwise we will absolutely not be able to escape smoothly!"
Shen Feng and Chu Chaoyan put down the detectors, then cut them in half with their swords. The detectors were immediately scrapped and could no longer emit ultrasonic waves.
"Damn it, why did I only remember this now? If I had realized this problem earlier, wouldn't I have avoided this danger?" Shen Feng was very self-reproachful. He had known for a long time that the corpse king could emit ultrasonic waves, but he had made a mistake in this regard.
Chu Chaoyan quickly comforted him, "It's okay, we haven't encountered any zombies yet, have we? Let's leave through other tunnels. Fortunately, we've killed all the zombies in these tunnels, so there won't be any danger for a while."
Shen Feng was silent for a moment, then suddenly turned off his flashlight and said to Chu Chaoyan, "We must save supplies now. Only one flashlight can be turned on. Without light, we can't see the road, nor can we find our way in the tunnels."
Shen Feng then carried Chu Chaoyan forward in the tunnel. However, he discovered at this moment that all the surrounding exits were blocked by zombies. No matter which exit Shen Feng went to, he only found exits blocked by earth and rocks, as if all escape routes had suddenly disappeared.
Chu Chaoyan guessed, "The corpse king must have discovered that we are gone, so he simply blocked all the surrounding tunnels, planning to catch us in a trap!"
Shen Feng stopped running and sighed, "If it's as you say, then it will be too troublesome. We haven't been to the farther tunnels, and we don't understand the terrain at all. We are very likely to encounter zombies. Once we are entangled by zombies, we will surely die!"
"Damn zombies, how can they be so despicable!" Chu Chaoyan couldn't help but curse. The hateful zombies were so despicable. The task of exploring underground was a complete trap, and now they were trapped underground. If they couldn't leave quickly, their lives would be in danger.
Shen Feng opened Chu Chaoyan's backpack. She still had more than twenty compressed biscuits in her backpack, but there was only one bottle of drinking water left, and only five dry batteries. With such limited supplies, they could only last for about two days underground, and during this time, they would also face the threat of zombies appearing at any time.
In addition to essential supplies, there were several bags of salt and some notebooks in the backpack. Shen Feng thought for a moment and threw the salt on the ground.
Seeing this, Chu Chaoyan quickly stopped him, "Don't throw it away! I rely on these salt to use my abilities. If you throw it away, what will I use for my abilities!"
Shen Feng shook his head helplessly and said, "We don't have much drinking water left, and your abilities can only produce chlorine gas from water. If you use your abilities, you will consume drinking water, and we will die of thirst. Don't worry, I will protect you and won't let you get hurt."
Hearing this explanation, Chu Chaoyan could only reluctantly put down the salt. She was thinking at this moment that it would be great if the battle took place by the sea. With her abilities, she could summon a large amount of chlorine gas with a wave of her hand, and no matter how many enemies there were, she could eliminate them. But what Shen Feng said also made sense. If drinking water was consumed, her abilities would have no room to be used.
"Alright, it's all up to you!" Chu Chaoyan said helplessly.
Salt is needed by humans because humans need to supplement sodium ions from salt. However, the supplement of sodium ions is within a certain range. Once the intake of sodium ions is excessive, it can easily lead to high blood pressure. Moreover, a large intake of sodium ions in a short period will lead to an increase in the osmotic pressure of the human body, making people particularly thirsty and needing to drink water.
As for the water left after Chu Chaoyan produced toxic gas, it was all sodium ions. Anyone who drank it would become thirsty and it would be completely unusable.
Therefore, Shen Feng threw away the salt after weighing the pros and cons. This thing was not important. Humans would only get sick if they did not ingest salt for a long time. Not ingesting salt for a short period would not be a problem. Instead of carrying it in the backpack and adding weight, it was better to throw it away to increase their speed.
Shen Feng and Chu Chaoyan sat in the tunnel to rest. Shen Feng planned to go to a distant, unknown tunnel to find an exit. It was impossible for all exits to be blocked. There must be an exit in the distance. The only problem was that it was easy to encounter zombies on the way to these exits. Once surrounded by zombies, it would be difficult to escape.
Chu Chaoyan was more optimistic. She believed that Lu Xian would definitely come with reinforcements. As soon as he found that she and Shen Feng had not appeared, he would definitely return to Yan Jing to seek help. As long as she could hold on until the reinforcements appeared, she would be saved.
Shen Feng touched the two long swords at his waist. He knew that this was the only thing he could rely on now. As long as the swords were in his hands, he would not be killed by zombies.
Shen Feng and Chu Chaoyan did not rest for too long. The ground suddenly trembled slightly, and the two immediately became vigilant. Roars came from both ends of the tunnel, accompanied by hurried footsteps. Zombies appeared at both ends of the tunnel. These zombies had hurried footsteps, kicking up countless dust in the tunnel.
Shen Feng quickly said to Chu Chaoyan, "Quick, get on my back, and take the backpack!"
Chu Chaoyan drew two daggers from her body and said seriously, "I can also fight."
"I'm not going to fight, I'm going to take you to escape. Fighting these zombies will only waste our physical strength. Hurry up and get on!" Shen Feng said.
Shen Feng bent down in front of Chu Chaoyan. Chu Chaoyan quickly climbed onto Shen Feng's back, her legs clamped around Shen Feng's waist. This way, Chu Chaoyan could stay steadily on Shen Feng's back. At this moment, Shen Feng chose a direction and rushed out, his twin swords constantly slashing, finally carving out a bloody path.
Shen Feng wanted to increase his speed to the extreme, but the tunnel was too narrow. As long as he moved forward, he would inevitably encounter zombies. His speed could not truly increase. He could only advance while slashing, until he cut through the tunnel blocked by zombies.
Fortunately, after Shen Feng became a fourth-tier ability user, his strength was inexhaustible, so he did not feel exhausted in a short period. He also carried Chu Chaoyan towards the unfamiliar tunnel. Since all the familiar tunnels were blocked, he could only head towards unknown directions. If heaven blessed him, he would surely find a new exit.
Shen Feng advanced with this thought, and the zombies in the tunnel seemed to appear endlessly. He killed one, and ten more rushed up. Under such circumstances, Shen Feng could only keep his spirits up and advance under the immense pressure from the zombies. Fortunately, Chu Chaoyan could help Shen Feng share some of the pressure, which allowed Shen Feng to advance.
Unknowingly, Shen Feng had killed thousands of zombies, and at this moment, he was already feeling tired. In the narrow tunnel, zombies rushed up in a line, as if lining up to die. But in reality, these zombies were just cannon fodder to consume Shen Feng's physical strength. No matter how many died, the corpse king would not feel sorry for them.
Hard work pays off. Shen Feng saw an opening leading to the ground in the distance. Upon closer inspection, the opening was not blocked. This meant that the hope of leaving the underground had appeared. As long as he could leave from here, he would be able to survive.
"Chaoyan, hold on, we'll be saved if we just rush over!" Shen Feng quickly said to Chu Chaoyan.
Chu Chaoyan, lying on Shen Feng's back, kept waving her daggers to kill the zombies in front of them. She was also relieved and echoed, "It's only a dozen meters away. We'll be safe if we rush over. I'll hold on."
Now that the opportunity to leave the tunnel appeared before them, Shen Feng and Chu Chaoyan had to treat it with all their might. They were only one step away from escaping. The opportunity was in their hands. If they missed this shot, wouldn't they regret it?
However, at this moment, the tunnel began to shake. Shen Feng and the surrounding zombies could not stand steadily, and the surrounding earth and rock walls were also shaking, as if they would collapse at any moment.
"Could it be an earthquake?" Chu Chaoyan asked frantically.
Before Shen Feng could answer, the ground suddenly began to collapse. This section of the tunnel fell downwards. Shen Feng and countless zombies also fell. No one expected that there would be space below, and Shen Feng ultimately failed to leave the underground through the newly found exit.
"Boom..." In the collapse of the ground, Shen Feng and Chu Chaoyan fell, along with many zombies. In the darkness, Chu Chaoyan's flashlight stopped shining, and the entire tunnel plunged into darkness.
Lu Xian, after leaving the tunnel, waited and waited but no one appeared, and he couldn't see Shen Feng's figure. He couldn't help but go to the surrounding tunnels he had explored before, but he found that all these tunnels were blocked. He immediately panicked. It seemed that the City Lord and Chu Chaoyan were trapped below. Now that the tunnels were blocked, he had no idea where they were to rescue them.
"No, I have to go back for reinforcements. My own strength is still too weak. Only by finding help can I rescue the City Lord!" Lu Xian thought about it and decided that seeking help was the only way. He thought that whether it was Guo Pinming or Yang Chang, both of them were ability users. With their help, their chances would be greater.
Lu Xian thought of this and quickly ran towards Yan Jing. However, before leaving, he left his backpack outside one of the tunnels. If the City Lord dug out earth and rocks from underground, he could also get some supplies.
Upon returning to Yan Jing, Lu Xian quickly found Yang Chang and Guo Pinming and explained what had happened that day. However, it was already close to dusk, and it would be dark soon. It was not a good time to set out for rescue. More importantly, they couldn't just leave their posts. Before Shen Feng left, he had also instructed the two to guard the city walls.
However, Guo Pinming came up with an idea. He said seriously to Lu Xian, "Quickly contact Xiao Sheng from the Ability Administration. He is the boyfriend of the City Lord's sister, and he definitely won't stand by and do nothing. Ask him for help. Also, I will set out with you tomorrow morning. The city walls will be handed over to Yang Chang!"
Yang Chang also wanted to go to rescue Shen Feng, after all, he was promoted by Shen Feng. At this time, it was only appropriate to go to search and rescue Shen Feng. However, he could only stay in Yan Jing. If he also left, his five thousand subordinates would completely lose their restraint, and the rescue mission could only be entrusted to Guo Pinming.
Yang Chang gave Guo Pinming a deep look and said seriously, "Old Guo, I'll leave everything to you. The City Lord must return safely, otherwise, how would we have the face to return and see the Deputy City Lord?"
Guo Pinming nodded seriously. He understood Yang Chang's meaning. Back then, he had disobeyed the City Lord's orders and rashly attacked, which eventually led to the annihilation of a thousand soldiers. Later, Shen Feng did not hold a grudge and sent him to the south to buy medicine, using missions to atone for his mistakes.
And now he needed to repay Shen Feng. Since they were in Jiangyang, he had always been taken care of by Shen Feng. If he didn't repay this kindness, he would be ungrateful. And Yang Chang could not leave Yan Jing, so the rescue mission fell on his shoulders alone!
Lu Xian didn't have time to say anything more and turned to find Xiao Sheng. Now, only Xiao Sheng could participate in the rescue. He was a genius from the Ability Administration and had many friends. If he was willing to help now, he would definitely play a huge role.