Xu Xin looked around again.

This space is not as big as the one in the World Tree, it is like a small world.

This place is obviously only about two kilometers in radius.

If the World Tree was not affected by the power of time and space, then the World Tree House above would probably be this big.

And at the end of the four sides, there is no soil or stone wall, but the roots of the world tree.

This entire area is wrapped by the roots of the World Tree!

Everywhere, everywhere!

This place is really interesting.

"A space encased in roots..." Shi Wanyun glanced around, then looked up at the core of the World Tree. "It's quite safe here too. Now that the World Tree has matured, its roots shouldn't be as easily destroyed as before. This place is essentially completely protected by countless roots."

"What is this? An underground shelter?" Lou Feier stepped on the thick roots under her feet. "There's not even any soil. The ground is covered with such thick roots, and it's not flat."

"Okay, we'll talk about the functions later." Xu Xin held down Keke, who was about to jump off his shoulder, "Let's go back first."

The rest of the explorers were still waiting for him.

Several people returned to the vine ball.

"Hmm...?" A hint of surprise flashed in Xu Xin's eyes.

At this time, several people felt that their feet were weightless again, and the vine ball suddenly began to fall again, and the speed was much faster than before!

"What...what's going on!" Lou Feier grabbed Xu Xin's arm, "Are we falling?! Aren't we supposed to go up?"

Zeng Tao grabbed Xu Xin's other arm and said in panic, "Are we going to fall to our death?"

"Don't panic, I'll let it go down." Xu Xin explained hurriedly, "Because, we can still go down."

"There's more down there? A second underground floor..." Zeng Tao complained, "It's not a shopping mall garage."

The feeling of weightlessness intensified again.

The descent speed has increased again!

This time, even Jin Yue and Shi Wanyun caught the people around them.

"Why is it so fast?" Jin Yue asked in confusion, but she trusted Xu Xin's judgment, so she was not worried.

"We're going to the underground world, right?" Shi Wanyun's tone became a little curious. "Xu Xin, you and Lou Fei'er have been to that underground world, right?"

Underground world.

That vast world at least several thousand meters deep underground.

Xu Xin hasn't gone down since the last underground world exploration activity.

"Isn't it true that I'm going to enter the underground world?" Xu Xin said to himself as he felt the weightlessness at this moment.

Judging from the feeling of weightlessness, their current descent speed should be six or seven meters per second.

Any faster and it would be equivalent to free fall.

If we keep descending at this speed for such a long time without stopping, we are really heading to the underworld!

The World Tree is actually connected to the underground world!