C1280 I Caught Another Zombie King

It was an alloy door, located on the left side of Clerk Chen's research room. It looked very sturdy and was connected closely with the surrounding walls, as if it was a whole body.

However, Wang Yi had some doubts. Sound had to be transmitted through the air, but how could the alloy door transmit sound when it completely isolated the air?

He couldn't help but glance at Lee Hu and the others