Heroes of The Sky – Chapter 1225

“Beacon...” Bill said calmly.

“Beacon, standing by...” the soldier replied.

The soldiers had set up a signal tower as tall as a person next to the drilling platform. The red and blue lights on the tower flickered alternately, making it look like a light tower used to guide people back to a military base.

But this was no ordinary signal tower. Instead, it was an underwater sonar transmitter, equipped with an HFG-091 electroacoustic converter and signal processor.

The base array, rack server, and auxiliary equipment were all integrated within the signal tower. At the same time, Bill would bring along an active sonar device the size of a suitcase when he entered the subterranean river to receive the coordinates of the signal tower.