"That—that man," stammered the lad.
"You don't mean to tell me that was one of the Happy Harry gang, do you?"
"No. But one, or both of those men, may prove to be worse. That second man was Addison Berg, and he's agent for a firm of submarine boat builders who are rivals of dad's. Berg has been trying to find out why we abandoned our intention of competing for the Government prize."
"I hope you didn't tell him."
"I didn't intend to," replied Tom, smiling grimly, "but I'm afraid I have, however. He certainly overheard what I said. I spoke too loud. Yes, he must have heard me. That's why he hurried off so."
"Possibly no harm is done. You didn't give the location of the sunken ship."
"No; but I guess from what I said it will be easy enough to find. Well, if we're going to have a fight for the possession of that sunken gold, I'm ready for it. The Advance is well equipped for a battle. I must tell dad of this. It's my fault."
"And partly mine, for asking you such leading, questions in a public place," declared Mr. Damon. "Bless my coat-tails, but I'm sorry! Maybe, after all, those men were so interested in what they
