The explorers soon befriended the natives, however, and discovered that the first explorer had reached the island of Vanikoro after his ship had sunk, after which he built another small boat before again disappearing on the sea.

So, no one knows what had happpened to that mysterious boat he built on the island? asked the captain with a smile.

No one knows.

Captain Nemo said nothing, but walked to the sitting room where the iron doors were opened.

I found the spot where that boat was lost, the captain told me with a smile.