“THAT’S HOW WE FOUND the Nipe,” Colonel Mannheim said, “and that’s how we keep tabs on him now. We have over seven hundred of these remote-controlled robots hidden in strategic spots in those tunnels now, but it took time to get everything set up this way. Now, we can follow the Nipe wherever he goes, so long as he stays in the tunnels. If he went out through an open air exit, we could have him followed by bird-robots but—” He shrugged wryly. “I’m afraid the underwater problem still has us stumped. We can’t get the carrier wave for the remote-control impulses to go far underwater.”
“How do you get your carrier wave underground to those tunnels?” Stanton asked.
The colonel grinned widely. “One of the boys dreamed up a real cute gimmick. The rails themselves act as antenna for the broadcas
