"You're in time for an exciting flash," Mr. Swift reported jubilantly.
"What is it, Dad?"
"An attempt to earthquake New York has just failed!"
Grins broke out on the faces of the crew as they heard Mr. Swift's words come over the loud-speaker. Bud let out a happy whoop.
"That's great, Dad!" Tom said. "Maybe we've got 'em licked on the quake front. No luck so far, though, on our new project."
"Well, keep in touch and let me know at once if anything happens," Mr. Swift urged.
"Right, Dad!" Tom promised.
Again the Swiftsure submerged. This time it was only a few minutes before Arv Hanson gave a cry of warning.
"Something on the sonarscope, skipper!"
Bud, Hank, and Chow hastily gathered around the scope to watch. The blip grew larger rapidly. It was clearly another submarine, closing in on a collision course.