The watch that Mary lent him to use temporarily is connected to the sensory of Iron Sentinel.
With it, they could always detect whenever enemies are nearby, with the exception of those that could avoid sensory detection or those underground.
And with how cautious Mary was staring at the ground beneath, Shi Tian could deduce it was the latter and not the former.
"How many enemies are underground, Mary?" Shi Tian asked, his left hand holding onto the pistol.
"Not sure, but they are moving at a fast rate. I suspect they are Moles." Mary squinted her eyes and said solemnly.
Moles are usually small creatures, ranging from about 4 to 8 inches (10 to 20 centimeters) in length, with a plump and cylindrical body.
And one of the most striking features of a mole was its specialized forelimbs.