C521 Researching Mecha Martial Skill 3

Slowly, the door opened. Outside was a huge stone slab, and inside was a steel plate that was one meter thick. According to this thickness, even the Laser Cannon would not be able to pierce through it!

"Crack!" A series of rustling sounds came from the side of the door. A furry rabbit jumped out from the grass and just happened to pass by the door.

"Woof!" After the sound of the cannon