When the class bell rang, Teacher Zhang Qian walked into the classroom with a covered object, which attracted the attention of all students.

Last time, she brought Jiaguo that grew under the water, but this time she didn't know what she brought again.

The classmate by the window consciously stood up and was about to close the curtains, Zhang Qian smiled and waved her hand: "No, I'm not afraid of light today." ”

With that, she put the things in her hand on the table and removed the cloth that covered them.

There was an exclamation in the classroom, and under the cloth was a round hamster cage, and there was a round hamster in it.

Tang Qianxue wowed: "It's so cute!"

Jiang Xiaotian frowned and glanced at Tang Qianxue, she didn't expect this eldest lady to like small animals so much, no wonder there were so many dolls on her bed.

Jiang Xiaotian raised his hand: "Teacher Zhang, is this rat a demon beast caught from the ruins?"

Zhang Qian sneered and laughed: "No, this is just an ordinary hamster, what I want to tell you today is not a hamster, but this cage." ”

Jiang Xiaotian looked surprised: "Isn't this just an ordinary wire cage, what is there to talk about?"

Zhang Qian touched the cage in front of her with her hand, and the hamster inside seemed to be frightened and began to run desperately, driving the entire spherical cage to rotate quickly and make a gurgling sound.

"Students, if you look at this cage as a world, what are the characteristics of this world?"

Zhang Qian's question stopped everyone, and the two hundred people in the classroom were silent and couldn't answer.

After a long time, one of them hesitated to speak: "This is a ...... Spherical world. ”

Zhang Qian smiled and nodded: "That's right, but I didn't find the key point, is there anyone else?"

"It's a world of hamsters!"

"It's a fenced world!"

......

The students were gossiping, but none of them seemed to satisfy Zhang Qian.

"I see!"

Tang Qianxue's eyes suddenly lit up: "This is a world without end!"

Zhang Qian glanced at Tang Qianxue approvingly: "That's right! This hamster will never be able to soak itself to the end, because this is a completely closed world with no end." ”

Zhang Qian pressed the cage with her hand and stopped the hamster's wild running: "Students, I let you see this cage today because this cage is very similar to the ruin space, and the ruin space is also completely closed, with no end to the world." ”

The students were a little dazed, and someone asked, "Teacher, is the relic space the same as this cage, a huge sphere?"

Zhang Qian shook her head: "It's not exactly the same, this cage is a three-dimensional sphere, and the hamster will return to the same place when it runs forward and backward, left and right." ”

"And the relic space is a four-dimensional sphere, not only front and back, left and right, but also up and down, if you keep flying up, you will eventually return to your original position. ”

Ninety-nine percent of the students in the classroom listened, including Jiang Xiaotian.

"Keep going up, and eventually return to the original position, what the hell is this situation, I can't understand it at all!"

Tang Qianxue frowned and glanced at Jiang Xiaotian: "This is Mobius space, Mobius means closed, I talked about it in high school class." ”

Jiang Xiaotian sighed: "I'm a college student now, and I must have forgotten all the knowledge of high school~"

Zhang Qian smiled on the podium and looked at the students below: "Maybe you can't fully understand the concept of the ruin space yet, but it doesn't matter, you will enter the real ruins in a few days, and then you will be able to feel what the closed space is like." ”

"I'm telling you this today, so that you can have an idea of the relic space, so that you don't have to be at a loss after actually entering it. ”

The white puppet, who had been silent before, snorted: "It's useless to speak, those who can understand will naturally understand, and those who can't understand still can't understand even if they speak." ”

Jiang Xiaotian turned his head to look at Bai Puppet, remembering the task given to him by Li Baichuan.

"Looks like you know a lot!"

The white puppet nodded: "If you usually read more books, you will find that what they talk about is in the books." ”

Jiang Xiaotian sighed: "I don't have that much time, after all, unlike you, I must be very idle in the Heavenly Prison." ”

The white puppet's face changed suddenly, and he turned his head to look at Jiang Xiaotian: "You...... How do you know?"

Jiang Xiaotian shrugged his shoulders: "What do I know? You have been in the Heavenly Prison? I just said it casually, am I right? You really stayed in the Heavenly Prison?"

Jiang Xiaotian's series of questions were extremely annoyed, and he snorted: "Ignorant people. ”

Jiang Xiaotian leaned in front of the white puppet: "Hey, why did you go to heaven, tell me, I'm curious~"

The white puppet glanced at Jiang Xiaotian coldly: "You don't need to know, because someone like you will go to the Heavenly Hell sooner or later, and you are different from me, you will never have a chance to come out of the Heavenly Prison!"

Jiang Xiaotian stuck out his tongue: "Then forget it, I'm fine outside, don't go." ”

Tang Qianxue listened a little inexplicably on the side: "You two, what are you talking about?"

Jiang Xiaotian squeezed his eyes: "Secret." ”

......

In fact, when Jiang Xiaotian and Bai Puppet were talking about Heavenly Prison, there was another person who was heading towards Heavenly Prison, and that was Huang Cheng.

At this moment, in the hinterland of Tibet, above the 6,000-meter plateau, rows of snow-covered peaks crisscross each other, like groups of sleeping giants, standing silently under the gloomy sky.

Halfway up one of the towering snow-capped mountains, there is a very inconspicuous little black dot moving slowly, which can only be distinguished at very close range in the middle of the night when the stars and moon are dark, and it is a lone climber.

Climbers walk slowly, facing the howling cold wind and climb step by step towards the top of the snowy peak.

The heavy thermal suit, as well as the goggles that covered the entire face, made it impossible to distinguish the appearance of this person, but a mouth could still hear that it was a yellow-orange voice.

"Li Baichuan, this bastard, is not my boss anymore, and he still gives me such a troublesome job!"

Huang Cheng complained in her mouth, and continued to go up in the heavy snow, which made her feet sink deep and her physical exertion was extremely exertional.

But fortunately, Huang Cheng's ability is super power, so climbing the snowy mountain with weight is not an impossible task for her.

Halfway up this snowy peak is the "Heavenly Prison" of Southeast Tex, which is used to imprison the most dangerous supernatural prisoners.

The security facilities inside the prison are interlocking, and the security is extremely tight, especially the surrounding airspace is very closely monitored, and no flying vehicle can approach without alerting the guards.

Therefore, hiking up the mountain became the only way to get close to Hell, and it had to be at night to avoid being detected by the sentry.