Let's finish this (Step one)

"Can they see us from the outside?" Lei asked Von while devising a lot of ways to escape this prison.

"I don't think so." Von said while trying to see something beyond the bright electric bars of their cell, "If we can't see them from the inside, maybe they can't see us from the outside too." 

"Good point," Lei said and focused his attention on the ground beneath them.

"Are we in an actual cave or are we underground in the city? Because from what you said, I don't think we've gone far enough to reach the mountains and the borders of this island." Von said while looking at the big bulks of rocks surrounding them.

"I think we're underground in the city and I think they've just built this cave recently," Lei said and grabbed a small shovel from his tool belt that the Crones did not even bother taking off of him since their bars were made of electricity anyway and they thought his tools wouldn't be able to break it from the inside.