The probe ball quickly rolled across the stone gate, and the data was quickly transmitted in real time.

"Captain, the oxygen concentration in it is only less than seven percent, and there is a strange gas in the air, which should be the kind of poisonous gas that Mr. Zhang said, the visibility inside is extreme, it can be said that you can't really reach out and lose your fingers! And it is very humid, and the air contains a lot of moisture!"

Qin Duanyang looked at the real-time footage of the probe ball uploaded from the hand tablet, and couldn't help frowning: "The oxygen content is extremely low, and the oxygen that each of us carries with us is limited, and it can only support half an hour at most, which means that if we decide to move forward, we will need to return in fifteen minutes at most, Xian Hei, what do you think?"

Zhang Xianhei hesitated for a while and then put on an oxygen breathing mask: "It's all here, how can there be any reason to go back?"

"Okay, everyone, it's the right time, fifteen minutes, whether you're with me, or you're left behind, or whatever, you have to come back, or you'll die of running out of oxygen, you know?"

"Yes!"

All the people put on oxygen breathing masks and began to move forward cautiously, and the four of them, Miyamoto Keiko and Yao Xun tightly guarded Jiang Rongrong by their side, beware of touching any mechanism to hurt Jiang Rongrong.

After everyone walked forward for two minutes, there was a stone staircase leading to the ground, because it was too dark inside, and the length of the stone staircase was too large, even with the help of advanced equipment, it was impossible to know how deep this stone staircase led to the underground, let alone whether there were other dangers ahead.

However, because of the limited time, the group had no time to hesitate, and Qin Duanyang and Lin Chengyuan took the lead and walked down the stone ladder to the depths of the ground. Seeing this, the others also followed behind the two of them, and the group moved forward cautiously as explorers.

After the group had walked for a minute, the stone staircase suddenly changed direction, and at the corner, the group passed through the edge of the stone staircase without a guardrail and found that the entire stone staircase was spiraling downward.

Qin Duanyang and Lin Chengzhi glanced at each other, although they couldn't see each other's eyes in the dark, they both felt that the other party had no intention of retreating, and the two continued to take the lead and explore down the spiral stone staircase.

After more than ten minutes of walking, the group was still exploring on the boundless stone stairs, and at this time Lin Chengyuan had already begun to hesitate: "Duanyang, we have already walked for thirteen minutes and twenty seconds, time is running out, do you want to continue?"

Qin Duanyang's right hand shook slightly, to be honest, Qin Duanyang was not willing to let this exploration end in vain, but Lin Chengyuan's concern was unreasonable, the oxygen left for the group was almost half used, if the return trip was delayed, the group might die of lack of oxygen here because of their own mistakes.

Qin Duanyang gritted his teeth, and finally decisively gave the order to retreat: "Everyone has it, hurry up and retreat back, the oxygen in our body is almost enough to return, we can't delay time here!"

"Yes!"

Jiang Rongrong and Zhang Xianhei have no objection to Qin Duanyang's decision, after all, the road ahead is still unknown, once there is a lack of oxygen, then there is really no way at all, they can only wait for death!

When a soldier of the Skynet commando team turned around and was about to retreat, perhaps it was too dark to see clearly, and he actually stepped on the air and fell to the ground.

"Ah......h

The fallen soldier quickly fell to the outermost part of the stone staircase, because the stone staircase had no railing, and the soldier fell down the stone staircase without hindrance.

"Stone!" Lin Chengyuan was in a hurry, and hurriedly ran to the periphery of the stone ladder and shouted to the fallen soldiers, "Stone!

"Let's go, it's only fifteen minutes and thirty seconds of oxygen supply!" Qin Duanyang grabbed Lin Chengyuan, who wanted to go down to search for his subordinates.

Lin Chengyuan was also anxious after being grabbed by Qin Duanyang: "Let go of me, I'm going to find my soldiers!"

"You're crazy! You're going to kill everybody!"

Lin Chengyuan's two fists were clenched tightly, Lin Chengyuan also knew that Qin Duanyang was telling the truth, if he continued to delay, it would only affect others, Lin Chengyuan sighed heavily, and it was officially the intention of giving up searching for his subordinates.

"Captain...... Captain...... "A male voice came from the bottom of the stone staircase, and it was the soldier who had fallen down before, "There is a horizontal passage here, which is related to the opposite side of the passage, and there is oxygen here, my oxygen breathing mask just fell off, I can breathe without oxygen supply, although the concentration of oxygen is a little lower, but I can barely breathe!"

Lin Chengyuan and Qin Duanyang glanced at each other, and both of them felt excited.

Keiko Miyamoto quickly rushed to the edge of the stone staircase: "Listen to the sound below, at a depth of three meters at most, it's still too late!"

"Let's go!" Qin Duanyang quickly waved his hand and began to rush under the stone ladder with the people under his hand.

The probe ball held in the hand of an ice leopard soldier constantly checked the composition of the air, and at the bottom of the stone staircase, the air composition had become normal, and the poisonous gas that Zhang Xianhei said had disappeared, and although the concentration of oxygen was low, it could barely provide people with breathing.

The group quickly turned off the oxygen bag they carried, and the remaining oxygen on their bodies had to be kept for when they withdrew from the stone ladder, and the air at the bottom of the stone ladder was already for people to breathe, and naturally there was no need to continue to wear oxygen breathing masks to consume the oxygen reserves on their bodies.

At the bottom of the stone staircase, there is a parallel path leading to another location, and on the opposite side of the passage comes a faint light, presumably the oxygen at the bottom of the stone staircase also comes from the opposite side of the passage.

The Ice Leopard Soldier placed the probe ball on the passage again, and the probe ball kept rolling forward.

To everyone's surprise, on the other side of the passage, the composition of the air was exactly the same as that of the outside air.

Qin Duanyang looked at the bright picture transmitted by the probe ball in surprise: "Could it be that the other side is in the open air? Otherwise, how can it be that in such a closed environment, the air composition is exactly the same as the air outside, even if there is a vent, it will not be exactly the same as the outside world!"

"In the open air, does that mean there is no danger on the other side?" Lin Chengyuan looked at Zhang Xianhei suspiciously.

Zhang Xianhei was puzzled for a while, and when Zhang Xianhei saw the real-time video screen from the probe ball, Zhang Xianhei shook his head very decisively: "No...... The opposite side is more dangerous, I don't know how many times more dangerous than the place we just passed, we have only seen some old human remnants when we first arrived at the poisonous gas area, you see the current picture, there are human remnants everywhere, indicating that there is a danger on the other side that we have not encountered!"

"What could it be? or what kind of virus or bacteria?" Qin Duanyang also looked at the video screen suspiciously.

"Viruses and bacteria should be unlikely, as we all know, the mummification curse incident that caused a lot of uproar many years ago is actually those archaeologists infected with viruses or bacteria that only existed in ancient times and have become extinct in modern times in the mummy tombs, and people infected with this virus or bacteria will not die in a short time, but will die after a while, so it caused people to panic about the mummy curse, that is, these people were not killed by some viruses and bacteria!"

"That's weird...... Qin Duanyang gently touched his chin with his right hand, "There's nothing wrong with the composition of the air...... Excellent light conditions......"

Before Qin Duanyang's words were finished, an extremely strong light suddenly appeared in the frame of the video, and then the picture quickly disappeared.

"What's going on?" Qin Duanyang asked loudly.

An ice leopard commando soldier behind Qin Duanyang wiped the sweat from his forehead, and hurriedly worked on the computer for a while before sighing helplessly: "Probe ball...... The probe ball has been damaged!"

"What, damaged?" everyone looked at the soldier in surprise.

"Right...... I can't contact the probe ball at all, it can only be damaged!"

"Could it be that light?" Jiang Rongrong looked at the faint light on the other side of the passage in confusion.

"Yes...... Zhang Xianhei also nodded thoughtfully, "It stands to reason...... If the light on the opposite side is stable, there will be no particularly strong beams...... But just a beam of light shone through, and the probe ball broke......"

"Is it difficult or can't it be a laser weapon?" Qin Duanyang couldn't help but pout.

"Let's go over and have a look first, let's go to the entrance of the passage first, it's a big deal not to go in!"

After Lin Chengyuan finished speaking, he took the Skynet commando soldiers under his command and began to explore the way, and Qin Duanyang quickly followed behind him with the people of the Ice Leopard Commando.

Jiang Rongrong glanced at Zhang Xianhei and Miyamoto Keiko, and after getting the two of them nodding in agreement, Jiang Rongrong followed behind Qin Duanyang with the people on his side.

The group came to the opening on the opposite side of the passage and found something strange on the other side!

The opposite side of the passage is not an open-air space at all, on the contrary, it is still a semi-enclosed space, but there are dozens of strong rays of light shining in at the mouth of several passages in this space, because there is light, plus there are a few vents, the whole space is full of plants, as for the super strong light that seemed to destroy the probe ball before, I didn't see it at all.

Jiang Rongrong looked at the several passages with strong light in surprise: "This ...... Why is there such a strong light coming from the other side of the tunnel? Even if the sun is shining directly, it can't reach such an extent, right? And what the hell is the super strong light that just shone on the probe ball?"

"You ask me, who do I ask? I haven't been here, my knowledge of this place is limited to the record in a book circulated in my family, I don't know much more than you......" Zhang Xianhei pouted helplessly.

"What should I do?Duanyang, do you want to send someone to take a look?" Lin Chengyuan looked at Qin Duanyang's side face and consulted Qin Duanyang's opinion.

"This ......" Qin Duanyang couldn't help but hesitate.

To be honest, the people who followed the Imperial Mausoleum this time, whether they were from the Ice Leopard Commando Team or the Skynet Commando, were all the elite of the elite! Even if a person was lost here, it would be a huge loss for the Xia State and the military, Qin Duanyang was also frightened by the mysterious super light that appeared in the video screen before, people always felt an inexplicable panic about unknown things, and Qin Duanyang was no exception.

Keiko Miyamoto, who was standing behind Jiang Rongrong, took a few steps forward and said in a deep voice: "Let me try it!"

"Keiko!" Jiang Rongrong was not happy, the mysterious super light before made Jiang Rongrong also feel frightened, if Keiko Miyamoto fell in this imperial tomb, this would be absolutely unbearable for him!

"Don't worry, I know it!"

Keiko Miyamoto ignored Jiang Rongrong's dissuasion, and walked towards the space in front of her step by step.

Just when Keiko Miyamoto walked more than twenty steps, Jiang Rongrong's face behind him suddenly changed greatly, and he couldn't help but shout in horror: "Keiko!"