The Nautilus Arrangement
The Nautilus is described as having a cylindrical hull 70 meters long and 8 meters in diameter, which I have indicated with this outline, and I could just about fit all the internal settings as described by Jules Verne on one level (the mid section), that could house the cabins of Professor Aronnax (2.5 meters long) which would have room for a simple bunk, writing deck, chair wardrobe and adjoining W.C with show, working back then to Captain Nemo larger room (5 meters long) with a work area and W.C. that could contain a bath.
Moving back we have the salon (10 meters long) with the large portholes for viewing the undersea world, this room doubles for museum, that contains art and marine collection of some significant value, next is a dining room (5 meters long) of some elegance and adjoining that is the Library (5 meters long) containing 12,000 books.
We are now at the midpoint of the submarine where you will find a spiral staircase connecting 3 level the size of this central section is not given this area connects to other smaller rooms that house the galley & some storage rooms, where I have placed our other two passengers Ned Land and Conseil as they travel 20,000 leagues under the sea’s, moving further back we have a large W.C or bathhouse for the crew which I have estimated at 12 men can bunk comfortably. Then there is the batteries and engine machine area
Information sourced from http://www.vernianera.com/Nautilus/