"I found it in the locker of our sleeping cabin, and hid it in my clothes," Dave answered, as he again tested the light. "I did not want to speak of it unless there should come some hope to us. This light was evidently left by some German who had used that cabin. It's waterproof, too. When I found it I had a hope that it might come in handy before I got through with this adventure. And now!" Waiting only a minute or two longer, Dave, clinging to the spar with one arm, held the other hand as high aloft as he could. "Help!" he signalled by flashes in the Morse code. "Help!" "It is such a tiny glow, to carry so far!" sighed the Englishman. "Maybe id vill seen be," said Captain Kennor. Dave continued to signal until, to his great joy, there came an answering signal from a blinker light which asked: "Who are you?" "Four castaways, clinging to a spar. Help before we freeze!" Dave flashed back, desperately. "If only the commander of that boat does not suspect us of being a German submarine springing a trap!" cried the Englishwoman. A searchlight flashed up, then its broad beam stretched across the waters as the operator tried to pick up the floating ones. Dave threw the flash into a continuous light while the searchlight beam continued groping. Then, in a blessed instant, the beam struck almost blindingly across the spar and the four human beings held up by it. "Now, they've spotted us," Dave cried, exultingly. "They won't run away and leave us without a look-in." Holding the spar with the searchlight beam, the destroyer changed its course, bearing down rapidly upon them. Then it stopped and a motor launch was lowered from davits. With a burst of speed the launch came alongside the spar. Busy hands were outstretched. The Englishwoman was the first to be taken aboard, after a few quick slashes had freed her from the binding cord. [Illustration: "Help!"] "Why, here's Lieutenant Commander Darrin!" exclaimed a voice. Dave, almost too weak to speak, was hustled into the boat, then the other two men were taken over. Blankets were wrapped about the rescued ones, and the launch dashed back to her ship. "A woman, Lieutenant Commander Darrin and two other men!" the officer in charge of the launch hailed the destroyer. "Darrin!" cried a voice. There was even greater bustle at the top of the gangway that had been lowered as the launch ran alongside. As swiftly as possible the four rescued ones were rushed up the side. "Old Darry himself, eh?" cried a joyous voice, as Danny Grin hurried up. "Has the woman any relative in the party?" "Yes; her husband," Dave answered weakly, then collapsed. "Take the woman and her husband to my quarters," Dalzell directed. "Have a cot put in and lashed for the husband, and put the woman in the berth. Mr. Darrin and the other man will go to the sick bay."