After their brief self introduction, one of the teachers said, "your task today is to get familiar with the base. I hope you take it seriously."

A few people were stunned. They were familiar with the base. Why should they be so serious about such a simple thing?

It seemed to see what several people were thinking. The instructor opened his mouth and explained, "most of the deep sea under the base connecting the island are buried in the sea, and what you see is only a small part."

"If you want to calculate the height, the whole base has a total of 66 floors and thousands of rooms and passages, and you must remember every passage, every room and every vent in one day."

A few people smiled at the corners of their mouths. As the man's words froze one by one, did they regret it now?