Mingled with this roaring was the shivering, vibratory sound which Prester Kleig had experienced in his half-dream. The sound was so intense that it fairly rocked the Secret Room to its furthermost cranny.
For a second the dreadnought, wounded to death, seemed to shudder, to hesitate, then to move backward as though wincing from her death blow. It was the pound of the inrushing waters which did it. Then up came the stern of the mighty ship, as she started her last long plunge into the depths.
But attention had swung to another warship, on the starboard beam of which another aero-sub had taken up position. Again the ebon streak of death from her blunt nose, smashing in and through the warship, directly amidships, cutting her in twain as though the black streak had been a pair of shears, the warship a strip of tissue paper.
Up went the prow and the stern of this one, and together, the water separating the two parts as it rushed into the gap, the broken warship went down to its final resting place.
Abruptly Professor Maniel swung back to the American planes which had come back to investigate the activities of the aero-subs, and on the screen, in the midst of the battle formation into which the pilots had swept to hurriedly, the Secret Agents could see the faces of those pilots....
White as chalk with fear, mouths open in gasping unbelief. One man, a pale-faced youth, was the first to recover. He stared around at his compatriots, and plainly through the sound apparatus in the Secret Room came his swift radio signals.
"Attack! Who will follow me against these people?"
His signals were very plain. So, too, were the answers of the other pilots, and the heart of Prester Kleig swelled with pride as he listened to the answering signals—and counted them, discovered that every last pilot there present elected to stay with this youngster, to avenge their country for this contemptuous insult which had been put upon her by the rape of Hampton Roads.
Into swift formation they swept, and with these planes—all planes in use were required by franchise of operating companies to be equipped for the emergencies of war—swung into an echelon formation, the youthful pilot leading by mutual consent.