"It is marvelous! And I see, Captain, you were right to make use of this agent that takes the place of wind, water, and steam."

"We have not finished, M. Aronnax," said Captain Nemo, rising. "If you will allow me, we will examine the stern of the Nautilus."

Really, I knew already the anterior part of this submarine boat, of which this is the exact division, starting from the ship's head: the dining-room, five yards long, separated from the library by a water-tight partition; the library, five yards long; the large drawing-room, ten yards long, separated from the Captain's room by a second water-tight partition; the said room, five yards in length; mine, two and a half yards; and, lastly a reservoir of air, seven and a half yards, that extended to the bows. Total length thirty five yards, or one hundred and five feet. The partitions had doors that were shut hermetically by means of india-rubber instruments, and they ensured the safety of the Nautilus in case of a leak.

I followed Captain Nemo through the waist, and arrived at the centre of the boat. There was a sort of well that opened between two partitions. An iron ladder, fastened with an iron hook to the partition, led to the upper end. I asked the Captain what the ladder was used for.