Old Zhang was finally relieved.

Wang Lan looked at Sun Muchen and asked curiously, "What did you just move?"

Sun Muchen was taken aback, and quickly led the two of them toward the red button.

Old Zhang stared at the button for a moment and said, "This should be the switch for the light network. The final fortress must have realized that the door should be the weakest point of this building, so they added an extra layer of defense."

"What's this?"

Wang Lan tapped on the fire hydrant and looked at Sun Muchen: "What is a fire hydrant?"

Sun Muchen thought for a moment, then shook his head and said, "I don't know. I don't think I've seen any information about fire hydrants in the books you gave me."

After saying that, the brother and sister both looked at Old Zhang.

After all, Lao Zhang's knowledge base and Sun Muchen's knowledge base are completely different.

"Uh..." Old Zhang was stumped by the question. He seemed to have heard the name "fire hydrant" before, but he couldn't remember what it was for.

Firefighting…

Is it to extinguish people's anger?

Or is it a burning fire?

He walked around the fire hydrant twice and found that it was mounted on the wall, not a single piece.

Then I walked to the front, found the handrail, and pulled open the suitcase door.

Inside were a water bag, an axe, and a red metal bottle.

"I remember now!"

Old Zhang took out his axe and said, "I knew this fire hydrant sounded familiar; it's a place where you can get loot!"

Wang Lan was stunned, "Drop...drop equipment?"

"Yes! Isn't this axe just equipment?"