"There's something adrift yonder," he observed, pointing. "Stickin' out of the water. Looks like a spar."
Sanderson, with his glasses to his eyes, wheeled till he got the direction of the captain's pointing finger.
"I see it. No spar, Captain," he said swiftly. He glanced up at the first officer on the quarter-deck. "Mr. Orcutt!"
"Aye, aye!" replied the officer, coming to the rail.
"They've spotted us," the aviator said, his voice unshaken. "See yonder?"
His own glasses found the object again. Captain Dexter uttered a startled expletive. Aunt Roberta grasped Belinda's arm. The latter asked:
"Surely, it isn't a submarine, Mr. Sanderson?"
"That is a periscope. I've seen one before!" cried Sanderson, his eyes glued to his glasses. "Yes, she is approaching! She'll be near enough, if we follow our present course, to launch a torpedo in five minutes!"