"Master, I only sense underworld energy," Yanael confirmed Zach's guess as soon as Dukiel had left.
Zach nodded as he looked into the darkness of the tunnel.
If they could pump underworld energy to the surface through a hole wide enough that throwing a rock to the other side could be difficult, they could pump it through a person-sized tunnel. If they had one such pump, they would have another. It didn't matter that Zach had killed the one under the hole in the forest.
Because the tunnel was so much narrower than the hole in the forest, the pressure and force behind the underworld energy would be a lot higher. It would be like a jet stream of underworld energy that would flood the sewer system before catapulting into the city and the air through the few available manholes. It might even be powerful enough to break through the sealed manholes.
But that would only be a concern if Zach let it into the city in the first place.
