chapter 92 The stone gate opens ===

Briar also wore a gas mask.

She stepped forward, observed carefully for a while, and then took out an instrument from her backpack.

"This is a magnetic field sensor that can perfectly detect changes in the surrounding magnetic field."

Song Yi explained with a smile.

It seems that he admires Briar, a junior.

Briar walked around the stone gate a few times, observing the values ​​on the detector, and fell into deep thought.

Chu Zheng said:...