Her boats were lowered and made towards all that was left of Back Cup.

The landing parties explored the ruins, and found a few horribly mangled corpses. Not a vestige of the cavern was to be seen.

One body, and one only, was found intact. It was lying on the northeast side of the reefs. In one hand, tightly clasped, was a note-book, the last line of which was incomplete.

A close examination showed that the man was still breathing. He was conveyed on board the _Tonnant_, where it was learned from the note-book that he was Simon Hart.

For some time his life was despaired of, but he was eventually brought round, and from the answers made to the questions addressed to him the following conclusion was reached:

Moved to his very soul at the sight of the tricolor flag, being at last conscious of the crime of _lese-patrie_ he was about to commit, Thomas Roch rushed through the passage to the magazine where a considerable quantity of his explosive was stored. Then, before he could be prevented, brought about the terrible explosion which destroyed the island of Back Cup.

And now Ker Karraje and his pirates have disappeared--and with them Thomas Roch and the secret of his invention.

THE END.

End of the Voyage Extraordinaire