As they passed, Jack noticed the U-6 a short distance away and made out Lord Hastings' figure on the bridge. He raised an arm and waved it. He was not sure that his signal had been seen, but he did not wish to draw further attention to his commander.
Aboard the submarine the German commander had them taken to his own cabin, where he insisted upon his own surgeon dressing Frank's wound and having a look at Jack's arm.
The surgeon pronounced both injuries slight and prescribed rest. Several times Frank caught the German commander looking at him curiously and it worried him somewhat, for there was something familiar about the man, though Frank could not seem to place him.
"I'm just trying to think," said the German to Frank, "where I have seen you before. I don't place your name."
"I can't remember you, sir," replied Frank.
Suddenly the German slapped his thigh. Frank's heart sank for some reason he was unable to explain to himself.
"I have it!" exclaimed the German. "You are the lad whom I captured from a British submarine in the Kiel Canal not so long ago. I remember you well now. You escaped. So you are a British spy, eh?"
"I—I——" began Frank.
The German raised a hand.
"It will do you no good to deny it," he said quietly. "I cannot be mistaken. Besides, I can plainly see now that you are no German; and this supposed-to-be German officer with you is also British. I can see it now. So is the other prisoner, though I cannot see what you should have been fighting about."