 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. Overhead, the sky was a storm-racked mass of clouds, broken in one spot by a tiny patch of starlit blue. Nelson shouldered his way inside, and stood there in his dripping oilskins, blinking his eyes against the yellow light. 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. "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.
 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.