Then Pomp quickly set the pumps going in the air-chamber, and the Explorer sprang up to the surface.

It was at this moment, as we have seen at the close of the preceding chapter, that the two explorers, Frank and Barney, reached the verge of the basin.

The commotion in the waters was nothing more nor less than the Explorer rising to the surface.

As the submarine boat sprang above the surface, Frank and Barney were fairly electrified.

It was a most unlooked for proceeding.

They could hardly believe their senses. A great cry went up from the two lost explorers.

“Whurroo!” shouted Barney. “It’s the Explorer as shure as I’m a Tipperary man, Misther Frank.”

“The Explorer!” gasped Frank; “but how on earth did it come here?”

This was a conundrum.

Yet there it was.