“You’ll never see the like of it again, boys—not in a hundred years,” Ensign MacMasters said with confidence. “That was a wonderful mirage!”

“But, Mr. MacMasters,” cried Whistler Morgan, “that vision was the reflection of something real, wasn’t it? An actual picture of a part of the sea?”

“So they tell us.”

“Where do you suppose that piece of water lies?” demanded the youth eagerly.

“I have no idea. ‘Somewhere at sea’! It may be north, east, south, or west of the Colodia’s present position. As I tell you, there is no means of making sure—that I know anything about,” he added, shaking his head.

“Oi, oi!” exclaimed Ikey. “Then we don’t know any more than we did before where that super-submarine is.”

“If that was a picture of her,” said Whistler thoughtfully.

“It is truly ‘all in the air’, boys,” laughed Ensign MacMasters. “We saw something wonderful. Every mirage is that. But it is a mystery, too.”

“Maybe that wasn’t the picture of the submarine, after all,” Ikey suddenly suggested. “Maybe that was the mirage of a real freighter we saw. Two stacks and as long as this old destroyer, I bet! Maybe it only looked as though it rose from the sea.”

“I’d wager money on it’s being a picture of a huge German submarine,” said Whistler with confidence.