"You will have to wait for an answer to that question," said Lord Hastings. "In the meantime, it would be well this afternoon to get whatever equipment you may need. Your other things, together with mine, are at the bottom of the sea with the old D-16."
"And perhaps," said Frank slyly, glancing at Lord Hastings, "before our present work is over we may know something of the mystery"—he lowered his voice—"of the vanishing submarines."
Lord Hastings eyed him somewhat coldly.
"Perhaps," he said, and, turning on his heel, left the room.
"You shouldn't have said that, Frank," declared Jack, when they were left alone. "You remember what he said about the walls having ears."
"I know it," said Frank, with sincere regret. "It just slipped out."
"If you'll take my advice, you'll see that it doesn't slip out again," advised Jack.
"I'll be mum from now on," said his chum with a slight smile. "But now I guess we may as well get what things we may need."
"All right," said Jack.
They picked up their caps and made their way from the house.