Frank Reade, Jr., opened his eyes and looked about him.

Wonder of wonders!

It was broad daylight.

They were on the surface of the sea. All about them was one heaving expanse of blue.

“Great whales!” cried Captain Hartley. “What sort of a transformation do you call this, mates?”

“We are saved!” cried Clifford.

“Begorra, it’s on the surface we are,” averred Barney. “Howiver did this happen?”

“Huh! Don’ yo’ know, I’ish?” cried Pomp. “Yo’ done lef de switch ob de reservoir turned on.”

“Bejabers that’s thrue!” cried the Celt. “I shure fergot it.”

“It’s all right!” cried Frank; “it helped the explosion to raise the boat. Now it is only a question as to whether the boat leaks or not.”