"But the jar of water would," observed Jack. "I heard a jar while I was down there."
"I don't believe it!" Jimmie cut in.
"When in swimming," said Frank, "did you ever sit on the bottom of the swimming hole and pound two stones together?"
"Of course," laughed the little fellow.
"And you heard a noise?"
"I believe I did, but it was not such a noise as one would hear from the same cause in the air."
"Well," Ned went on, "I heard noises down there, too, and I'll tell you right here that I'm alarmed."
"Scared!" roared Jimmie.
"Alarmed at what?" demanded Frank. "I didn't see anything to be alarmed at."
"I have no theory as to what it was I heard," Ned went on, "but I'm going to get a longer air-hose, shift the Sea Lion so she will hang over the wreck, and go down again right away."