Arriving at the tunnel entrance, Felix glanced at Paul. "Alright. Since Holden knows the way, you don't need to come. If things get dangerous, having an extra person to protect only increases the risk."

Paul understood. He had poured enormous manpower and resources into this search, yet they still had not found anything. That alone proved that ordinary means would not work, and there was always the possibility of real danger lurking below.

"Mr. Zeller, please… protect Holden. He's my only chil