After turning around several times, Sun Yan found that this straight mine tunnel was actually a disk-like enclosed space, and no matter which way you went, you would eventually return to the original point.

When he walked back again, he heard Cha Muque ask him lightly: "Why is it so long this time." ”

"Ah, I've spun around in there a few times." Sun Yan said with a frown.

Cha Muque didn't say anything when he heard him say this, but just looked at him puzzled, it was obvious that this mine was always straight, and it was impossible to turn around in it.

So, Sun Yan sat down on the spot and told the two of them about the situation just now.

After listening to Sun Yan's words, Cha Muque said: "You mean that although we are walking straight forward in the mine, we have turned a corner unconsciously?" ”

"Well, I don't know how to explain it. For example, as I said before, this mine is actually bending itself, and we can't help but fall into its dead loop when we walk in. And I found something very important. ”

"What?" Cha Muqi asked.

Sun Yan didn't answer him immediately, and only after half a sound did he snort and said, "I'll check it again." ”

In fact, Sun Yan has been wondering why every time he walks into the mine, the distance he can see is always farther than the last time, he thought that his eyes were adapting to the illusion generated by the mine. But a few more times in a row, he will find that each time he walks back to the mine crossing the time is always shorter than the last time. From this, he made a bold assumption, not that his eyes were looking farther and farther, but that the more he walked, the shorter the distance of the mine became.

With doubts in mind, he got up again and walked into the mine. Sure enough, this time before they had walked half the distance, they could already see Cha Muque and them, and when they looked back, they fell into darkness behind them. Sun Yan estimated in his heart that it would take him less time to walk back to the mine crossing this time than the last time.

Walking back to the original point, Sun Yan turned around and walked towards the face again, and this time the time he walked back was obviously less than the time it took just now, and when he saw Zha Muqi and them, he had walked less than ten steps.

Watching Sun Yan go back and forth like this six times, Cha Muque finally found something, he stood up and silently stared at the back of Sun Yan who had just turned around and walked into the mine.

This time, Sun Yan had just taken a few steps inside, he stopped, and couldn't help but tremble, although he was only a few steps away, he had already seen the Cha Mu Que who was silently staring at him on the other side of the mine. The reality was that Cha Muqi was only standing less than five meters behind him.

Sun Yan walked out of the mine, looked at Cha Muque's unfazed face, and asked, "You understand?" ”

Cha Muqi nodded and said, "It takes you a lot less time to walk back each time than the previous one, you just went in and walked a few steps before coming back." ”

"That's right, that's what makes this tunnel special. I think you didn't notice it because you were too scattered to go before. ”

Sun Yan walked to the wall as he spoke, sat down against the wall, pushed away the gravel under his feet with his feet, then picked up a stone and drew a circle on the relatively smooth ground, and said: "If you imagine the enclosed space in this mine tunnel as a closed circle, if I have to walk a full circle with a radius of 5 for the first time to return to the original point."

Sun Yan used a stone to point at the circle he had just drawn on the ground, and then put a circle in the circle, and said, "Then I only need to walk a full circle with a radius of 4.5 to return to the original point when I walk for the second time." The third time I only had to walk a full circle with a radius of 4 to come back, and so on, and when the radius of the circle was extremely small, I could take a few steps back to the original point. ”

As he spoke, Sun Yan quickly put small circles in the big circle, and he didn't stop until he couldn't draw it anymore. Cha Muqi looked at the circle on the ground, pondered for a while, and said, "Even so, there is only one problem in front of us, that is, we will never be able to get out of here. ”

Cha Muque's words are not wrong, although the test has been conducted many times and some slightly reasonable things have been analyzed for the time being, but the problem is obviously still there. At this time, Cha Muque's words were poured on Sun Yan's head like a basin of cold water, which couldn't help but make him feel cold, and then waved his hand and said, "It's okay, now that you know what's going on, it's only a matter of time before you find a way to get out." ”

After he finished speaking, not only did the corners of his mouth hang a wry smile, although he said this, he had no bottom in his heart at all. He leaned his head back and thought about some questions piecemeal, but his head was dizzy and swollen at this time, and his body was so tired that he collapsed, so he couldn't think of anything more, and his head leaned against the wall and fell asleep unconsciously.

This sleep was groggy for a while, and he kept dreaming in his head, which was very unsteady, and in the dream, Sun Yan found that he had been wandering around in a closed space, but he couldn't get out. At some point, he was shaken and woke up from his dream.

Suddenly opening his eyes, Sun Yan gasped a few times, only to find that he was already covered in a cold sweat. Straightened up, tilted his head to look, and found that Cha Muqi and Re Heimu were leaning against the wall on the left side opposite him, thinking that they were asleep, but looking at their upper bodies straight, they didn't look like them. In the semi-darkness, Sun Yan looked fixedly, only to find that the two of them were actually with their eyes open, and they were both staring at him with an extremely strange look at him at the moment.

To say weird, it's not because of how distorted their eyes are, but because the heads of these two people are not turned, they are still facing forward, or even tilted to the other side, only the pupils are moving to his side, although there is no superfluous expression on the faces of the two, Zha Muque's face is still indifferent, and Hot Black Wood's expression is still wooden, but just this weird action makes Sun Yan feel terrified.

Because he had just woken up, Sun Yan was confused, and he couldn't figure out the situation for a while, so he said what was wrong, and just as he was about to open his mouth to ask, he saw that Cha Muque actually winked at him.

Sun Yan was stunned for a moment, and said in his heart that he was hairy, why did he still throw up his wink? ! Goosebumps burst all over his body, but when he looked at it again, he found that something was wrong, and after Cha Muque blinked his eyes, his pupils moved towards the side of the mine again.

This time, Sun Yan understood, he meant to let himself look into the mine, although he was suspicious, Sun Yan still followed his gaze towards the mine.

As soon as he turned his head, Sun Yan saw that at the entrance of the mine road, there was a huge dark shadow standing impressively!