The latter glanced quickly at Tom, and then, with a hasty
word to his companion, the two swung around and made off in
the opposite direction to that in which they had been
walking.

"What's the matter?" asked Mr. Damon, seeing the young
inventor was strangely affected.

"That--that man," stammered the lad.

"You don't mean to tell me that was one 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