Chu Yao continued: "This elevator has a controllable panel. As long as you use the key, you can force the elevator to stop or continue running. Moreover, after removing the panel, you can see the environment outside the elevator."

Xiao Du stops once on each floor, not only to test the safety of the elevator, but also to see if there is any danger on the floor.

Moreover, since the wall near the elevator is not completely sealed, as long as the elevator car descends to the middle of the F1 and F2 floors, you can see the situation on both floors.

If there is danger on the next floor, he can also let the elevator quickly return to the previous floor.

"Although what you said makes sense, Xiao Du, like us, is here for the first time. How could he have the key to the elevator?" Zhou Weiqi said in confusion.

"Regular elevators require keys, but the elevator here requires a card to go up and down." Chu Yao's fingertips pointed towards the elevator's card reader, "Didn't you notice that he took the employee card?"

Among the pile of things Xiao Du packed, there were ordinary tools like screwdrivers and the small white card.

He tested it before entering the elevator. The employee card could be swiped directly to the F5 floor, and the authority was very high.

However, everyone else's attention was on Xiao Du's risk, and they ignored what he was doing.

"You said that person wants to lead us to the F3 floor. What is there? Will it pose a threat to us?" Ling Feng asked.

Chu Yao thought for a moment and replied: "The F3 floor is the factory workshop of the underground research institute. There are no living creatures there."

On the F3 floor, there are no humans or mutated creatures. They are all mechanical employees.

The little girl also went to the F3 floor herself. If the F3 floor was a very dangerous place, she would not risk herself.

Most likely, her status in the institute is not very high, but she is not a basic employee either.

That elevator card should belong to her, and her permissions were set to "F1 to F5 floors."

In a residential area like the F6 floor, after others move out, she has no right to enter, and naturally cannot obtain the materials inside.

If she wants to survive, floors like F5 and F4 filled with mutated creatures are very dangerous for her and not a good place to live.

The F1 layer has monsters that are very sensitive to sound, the F2 layer has nothing, and the rest is only the F3 layer.

Professor Xia shook his head and said in a deep voice: "I still don't understand why he can't leave here. When we came down, the entrances weren't all blocked."

"Perhaps the outside environment is harmful to her?" Zhou Weiqi guessed, "Didn't some human experiments often be done here before? He may also be one of the modified ones. For example, if the body's immunity is very low, it will be affected by exposure to other humans. Infections and illnesses and stuff like that.”

"There is another possibility that she is afraid of light." Chu Yao lowered his eyes and said.

She thought for a long time, that person was a human, not a ghost, so he couldn't be an earthbound spirit.

There are many differences between above ground and underground. The biggest one is that the ground is directly exposed to sunlight.

If she is allergic to ultraviolet rays or her eyes cannot be exposed to light, she will have no choice but to live underground forever.

Of course, this was not just Chu Yao's guess, but she suddenly remembered that the monster they just encountered was completely blind.

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