"Look at the big fish!" cried Mr. Damon suddenly, and he pointed to some dark, shadowy forms that swam up to the glass windows, evidently puzzled by the light.
"Porpoises," declared Captain Weston briefly. "A whole school of them."
The fish seemed suddenly to multiply, and soon those in the submarine felt curious tremors running through the whole craft.
"The fish are rubbing up against it," cried Tom. "They must think we came down here to allow them to scratch their backs on the steel plates."
For some time they remained on the bottom, watching the wonderful sight of the fishes that swam all about them.
"Well, I think we may as well rise," announced Mr. Swift, after they had been on the bottom about an hour, moving here and there. "We didn't bring any provisions, and I'm getting hungry, though I don't know how the others of you feel about it."
"Bless my dinner-plate, I could eat, too!" cried Mr. Damon. "Go up, by all means. We'll get enough of under-water travel once we start for the treasure."
"Send her up, Tom," called his father. "I want to make a few notes on some needed changes and improvements."
