The confusion in Su Yichen's eyes gradually faded, and he looked up at the fern tree in front of him again, and then carefully looked at the rest of the trees in the forest. Among these trees, there are magnolias, willows, maples, aspens, birches and even palms that he is more familiar with, but compared with the outside world, these trees are particularly tall and lush. Of course, in addition to these, there are many plants that resemble the fern tree in front of you, and although some of them have different appearances, you can still see the obvious characteristics of the fern from the shape of the leaves and roots.

His gaze gradually shifted from the forest to the grassland, and then to the distance. Although Su Yichen didn't know how big this place was, at least he didn't see the slightest edge in his vision, if this place was really created by man, then who had such an incredible ability to build such a vast world underground? And the sky, the sun that is almost the same as the outside world, where did they come from? What is the purpose of this place?

Countless answers formed a puzzle, inextricably linked but almost without the slightest clue, neither Su Yichen nor Wan Changchun could reasonably explain these questions. At this time, the delusions that had flashed in Su Yichen's mind and were previously considered to be somewhat unrealistic suddenly popped up again.

"You mean prehistoric humans, or aliens?" Hearing Su Yichen's somewhat hesitant idea, Wan Changchun couldn't help frowning.

"Teacher Wan, I know it's unscientific to say this, but judging from the current situation, ......." Wan Changchun is a scholar who is very rigorous, and when he saw him frowning deeply, Su Yichen thought that he was a little unhappy with his "nonsense", and hurriedly tried to explain.

Who would have thought, Wan Changchun raised his hand and interrupted Su Yichen's words: "No! Although we need to use science as an argument to conduct scientific research, it is not impossible to make bold assumptions in some cases. In fact, Xiao Su, your guess is also what I thought, from the discovery of that strange building to the present, it is almost impossible to explain it with the current scientific theory. Then we have to think outside the box and look at the problem from another angle, or even more daring guess. ”

"Teacher Wan, so do you think that kind of speculation is more likely?"

Wan Changchun thought about it and shook his head: "It's hard to say, I can only say that it's possible." Of course, the final answer may be different from our guesses, but at least for now, these two speculations can explain these problems for the time being. ”

Su Yichen nodded slightly, agreeing with Wan Changchun's point of view. If this hypothesis is used, then there are two possibilities for the place they are in now, the former is the remains of prehistoric humans, which would explain why extinct plants from the outside world are born here. Another possibility is that aliens built a biosphere-like site here, which could also explain the problem. But the more critical problem is that whatever possible is flawed.

This biggest flaw is why there are no animals in this place except plants, because no matter which possibility you can judge, even if prehistoric humans have become extinct, or aliens have left here, then at least there will be animals in this place that continue to reproduce, and now, except for the plants that enter the eyes, there is no sign of animals in zài, if it is due to some natural and man-made disasters, then this place should be completely destroyed, not what it is now.

This question also bothered Wan Changchun, and unlike Su Yichen, before Su Yichen came, he also studied the two giant trees, the size of these two giant trees really shocked him, because he couldn't judge what kind of trees these two giant trees were, and its huge size, the height of the canopy is unimaginable, according to the literature, the largest tree on the earth is a giant sequoia in California, USA, this giant sequoia is 100 meters high, The circumference of the trunk is 34.1 meters, and the age of the tree is about 2,100 years.

Compared with this giant sequoia, which has been recorded in human history, these two giant trees are only surpassed. After preliminary calculations by Wan Changchun, the circumference of the trunks of the two giant trees has exceeded 120 meters, and the height is at least several times that of this number. Moreover, Wan Changchun could conclude that these two giant trees would definitely not be cedar trees, let alone banyan trees, judging from the characteristics of their trunks and leaves, they seemed to be a kind of tree species that had never been seen before, and there was a strange red fruit on the tree, which he had never seen before.

For a moment, both Su Yichen and Wan Changchun were silent, and they each frowned and tried to figure out this qiē, looking for answers to explain these questions. Looking at them like this, Hu Zhijun on the side was a little anxious, there was a lot of delay from the beginning of the encounter with wolves along the way, and even lost Gudama's life in the desert, and now he didn't want to go out as much as he could, but he was thinking about what should not be eaten and drunk here, he really didn't understand why the experts' heads were different from his own.

Originally, Hu Zhijun didn't want to urge, but time waited for no one, and he finally couldn't help but ask, who was worried about the task.

"Leave? How to leave? Wan Changchun was stunned when he heard Hu Zhijun's words.

Hu Zhijun couldn't help but laugh and said: "I said Lao Wan, you are still a big expert, didn't Xiao Su say it just now, he came from a passage on the fork in the road, maybe the other passage is the way out." ”

"That's right!" Wan Changchun's eyes lit up, but what he thought of in an instant was a little different from Hu Zhijun, Hu Zhijun was planning to find a way out from another channel, and Wan Changchun was also thinking about whether he could find an answer to explain this qiē in the other channel.

At the same time, Su Yichen also thought of this, and his expression was a little excited, the three of them hurriedly cleaned up a little, and Su Yichen led the way back to the passage, and after a while, they came to the passage hidden behind the rocks by the lake, when they opened the vines and saw the passage, whether it was Wan Changchun or Hu Zhijun looked at the faint green light inside the passage and was amazed.

Su Yichen took the lead, Wan Changchun followed, Hu Zhijun walked at the rear, and the three of them entered the passage one after another. After walking forward all the time, after turning several corners, Su Yichen finally returned to the previous fork in the road. At this time, the room was still exactly the same as when he left, pointing to this room, Su Yichen told sù Wan Changchun that they themselves came down from it, if he guessed correctly, this room was probably an elevator-like lifting device, which could lead to the passage to the pyramid and the square.

Standing at the door of the room, Wan Changchun did not walk in, but took a closer look. In his opinion, the pyramids and squares depicted by Su Yichen, although strange, are not as attractive as the possibility of another passage containing the secrets of zài. Now, let's take a look at the untraveled passage, maybe it will surprise them.

When entering another passage, Hu Zhijun insisted on taking the lead, because he believed that this passage was likely to be dangerous because it had never been crossed, and for the safety of the experts, it was most appropriate for him to explore the way. For Hu Zhijun's resoluteness, Su Yichen and Wan Changchun could only agree, so Hu Zhijun advanced the passage and let Su Yichen keep some distance from him, and the three of them gradually groped for the past.

There are almost no differences from the previous passage, there are also many curves ahead, and the further you go, the more you go in, there are no dangers along the way. Gradually, the hearts of the three of them slowly relaxed, and when they turned another corner, Hu Zhijun, who was walking in front of him, suddenly stopped for some reason, and then quickly took a big step back, and Su Yichen, who was following closely, didn't notice and almost bumped into it.

"What's wrong, old Hu?"

"Be careful! There's someone ahead! Hu Zhijun took advantage of the situation to push Su Yichen back, flashed sideways, and at the same time took out the pistol that had been stuck in his waist.

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