 What is Androka trying to make?
SILENCE IS—DEADLY By Bertrand L. Shurtleff Radio is an absolute necessity in modern organization—and particularly in modern naval organization. Androka had arrived on board the Comerford the day before she sailed from Norfolk. With him came a boatload of scientific apparatus and equipment, including a number of things that looked like oxygen tanks, which were now stored in the forward hold. Androka had watched over his treasures with the jealous care of a mother hen, and spent hours daily in the room in the superstructure that had been assigned as his laboratory. It will be no more than Hitler can get when Zukor Androka decrees silence over the German airways! I have shattered them around your ship, just as I can eventually shatter them all over Central Europe!
 A zone of silence that stops all radio signals that attempt to penetrate it.
 A zone of silence that is intended to stop Axis economic flow.  A zone of silence that is deadly to all who pass through it.  A zone of silence that will stop Americans from being able to radio Europe.  A zone of silence that stops all radio signals that attempt to penetrate it.