He felt uneasy, however, almost powerless. What was this thing that had wiped out the crews of two dirigibles with deadly gas, and wrecked one of them? He spun around. The control car looked the same. But what might be moving in it?...
Chris carried no gun; but he extracted the service repeater from the holster of a body at his feet. Gripping it, he leaped to the helm of the dirigible. It was the work of a moment to clamp on the mechanical "iron mike," which steadied the ZX-1's mad swaying and leveled her ahead in a dead straight course. He could not cut down her speed, unless he went to each one of the hull-enclosed engine stations, and more urgent work awaited before he could afford to do that—work of sending out an S.O.S. before the weird, unseen killer and wrecker came to grips with him.
Though seeming hours, only minutes had passed since he had tooled his scout into the rack. Ahead, he could see the smudge of the Black Fleet's smoke on the horizon. Not so very far away, but a lot could happen in the distance still separating dirigible and surface craft.
He ran back into the radio-telephone cubby, which was a division of the control car. The operator was sprawled there, limp in his seat before the shining, switch-studded panel. Chris removed the head-gear of ear-phones: then he hauled one of the cubby's port-holes open, letting in a rush of cleansing air. His fingers sped quickly over the panel; a row of tubes glowed; the machinery hummed. Chris jerked off his mask.
A last faint odor was present, but he hardly noticed it, for his lips were at the mouthpiece and he was thrusting out a call for help.
"ZX-1 calling ... ZX-1 calling ... ZX-1—Hello!"
An answer from the flagship of the Black Fleet ahead had sounded.
"This is Travers, pilot on the ZX-1, speaking. We're coming dead for you; full speed; you'll see us in minutes. Get some planes with men capable of handling the dirigible up here immediately. The whole crew's been laid out by gas; there was a contrivance planted aboard to blow up the ship and send it down in flames as the ZX-2 was. The thing that did it—"
Crack!