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. While 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 harbor 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, vapor, 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 sand-bank—to us an immense cavern. Chance led me to discover it, and chance led 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 imbedded during the geological periods, now mineralized, and transformed into coal; for me they are an inexhaustible mine."
"Your men follow the trade of miners here, then, captain?"
"Exactly so. These mines extend under the waves like the mines of Newcastle. Here, in their diving-dresses, pickax and shovel in hand, my men extract the coal, which
