 The yellow-gray mist indicates which of the following?
SILENCE IS—DEADLY By Bertrand L. Shurtleff Radio is an absolute necessity in modern organization—and particularly in modern naval organization. [Transcriber's Note: This etext was produced from Astounding Science-Fiction April 1942. 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. Overhead, the sky was a storm-racked mass of clouds, broken in one spot by a tiny patch of starlit blue. It was Nelson, his shaggy blond brows drawn scowlingly down over his pale eyes; his thin face a mass of tense lines; his big hands fumbling at the neck of his slicker. Rain was coursing down his white cheeks, streaking them with glistening furrows. Nevertheless, his taut face, restless, searching eyes, and eternally nervous manner got Curtis' goat. Nelson shouldered his way inside, and stood there in his dripping oilskins, blinking his eyes against the yellow light. "I'm not sure about my dead reckoning. This storm—" Curtis threw his arm around Nelson's dripping shoulders. "But this storm, sir!" Nelson avoided Curtis' friendly eyes and slipped out from under his arm. "As if by providence, sir, there's a clear patch. "Here's what I make it," the commander told his navigating officer. Nelson's estimate, I'm checking back," he declared, frowning at the two papers and hastily rechecking his own figures. With all these rocks and islets—" "Radio?" repeated the little Czech, thrusting his face between the other two, in his independent fashion that ignored ship's discipline. It will be no more than Hitler can get when Zukor Androka decrees silence over the German airways! Then he hastened to the radio room, with Nelson at his heels, and the Czech trotting along behind. I have shattered them around your ship, just as I can eventually shatter them all over Central Europe! For the next two hours, no radio messages can enter or leave my zone of radio silence—of refracted radio waves, set up by my little station on one of the neighboring islets!" The answer came back: "Bearings north east by a quarter east, U. S. Cruiser Comerford !"
 Nazis are on The Comerford.
 A direct result of the zone of silence  Curtis will be killed.  The Holland blitzkrieg was a travesty  Nazis are on The Comerford.