“Is that you, Professor?” “Ah! Captain,” I answered, “where are we?” “Underground, sir.” “Underground!” I exclaimed. “And the _Nautilus_ floating still?” “It always floats.” “But I do not understand.” “Wait a few minutes, our lantern will be lit, and, if you like light places, you will be satisfied.” I stood on the platform and waited. The darkness was so complete that I could not even see Captain Nemo; but, looking to the zenith, exactly above my head, I seemed to catch an undecided gleam, a kind of twilight filling a circular hole. At this instant the lantern was lit, and its vividness dispelled the faint light. I closed my dazzled eyes for an instant, and then looked again. The _Nautilus_ was stationary, floating near a mountain which formed a sort of quay. The lake, then, supporting it was a lake imprisoned by a circle of walls, measuring two miles in diameter and six in circumference. Its level (the manometer showed) could only be the same as the outside level, for there must necessarily be a communication between the lake and the sea. The high partitions, leaning forward on their base, grew into a vaulted roof bearing the shape of an immense funnel turned upside down, the height being about five or six hundred yards. At the summit was a circular orifice, by which I had caught the slight gleam of light, evidently daylight. “Where are we?” I asked. “In the very heart of an extinct volcano, the interior of which has been invaded by the sea, after some great convulsion of the earth. Whilst you were sleeping, Professor, the _Nautilus_ penetrated to this lagoon by a natural canal, which opens about ten yards beneath the surface of the ocean. This is its harbour of refuge, a sure, commodious, and mysterious one, sheltered from all gales. Show me, if you can, on the coasts of any of your continents or islands, a road which can give such perfect refuge from all storms.” “Certainly,” I replied, “you are in safety here, Captain Nemo. Who could reach you in the heart of a volcano? But did I not see an opening at its summit?” “Yes; its crater, formerly filled with lava, vapour, and flames, and which now gives entrance to the life-giving air we breathe.” “But what is this volcanic mountain?” “It belongs to one of the numerous islands with which this sea is strewn—to vessels a simple sandbank—to us an immense cavern. Chance led me to discover it, and chance served me well.” “But of what use is this refuge, Captain? The _Nautilus_ wants no port.” “No, sir; but it wants electricity to make it move, and the wherewithal to make the electricity—sodium to feed the elements, coal from which to get the sodium, and a coal-mine to supply the coal. And exactly on this spot the sea covers entire forests embedded during the geological periods, now mineralised and transformed into coal; for me they are an inexhaustible mine.” “Your men follow the trade of miners here, then, Captain?”