Chu Yunsheng admired Xiao Qingshan and other soldiers' perseverance. With their ordinary human bodies, they could get to the bottom of the cave and even get to the levels that below the cave and then came back to the lakeside several times through a narrow crack.
What they did also teach Chu Yunsheng that having no power did not mean that human beings could not survive.
The broken notebook did not tell Chu Yunsheng what Xiao Qingshan saw on the third level below the ground, and Chu Yunsheng also was not interested in learning anything about it. He just wanted to leave this place as soon as possible.
According to the rough map Xiao Qingshan drew, the route they chose would lead them to the place they landed after they fell into the crack. Because of the earthquake, the crack collapsed right after they fell into it. But Chu Yunsheng was not worried, there was an insect "excavator" in his team, so there wouldn't be any problem for them to dig out of the crack.