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Indeed, after the most recent calculations this
reduction is only .000436 of an atmosphere for each thirty feet of depth.
If we want to sink 3,000 feet, I should keep account of the reduction of bulk
under a pressure equal to that of a column of water of a thousand feet.
The calculation is easily verified. Now, I have supplementary
reservoirs capable of holding a hundred tons. Therefore I can sink
to a considerable depth. When I wish to rise to the level of the sea,
I only let off the water, and empty all the reservoirs if I want the Nautilus
to emerge from the tenth part of her total capacity."

I had nothing to object to these reasonings.

"I admit your calculations, Captain," I replied; "I should be
wrong to dispute them since daily experience confirms them;
but I foresee a real difficulty in the way."

"What, sir?"

"When you are about 1,000 feet deep, the walls of the Nautilus
bear a pressure of 100 atmospheres. If, then, just now you were
to empty the supplementary reservoirs, to lighten the vessel,
and to go up to the surface, the pumps must overcome the pressure
of 100 atmospheres, which is 1,500 lbs. per square inch.
From that a power----"

"That electricity alone can give," said the Captain, hastily.
"I repeat, sir, that the dynamic power of my engines is almost infinite.
The pumps of the Nautilus have an enormous power, as you must have observed
when their jets of water burst like a torrent upon the Abraham Lincoln.
Besides, I use subsidiary reservoirs only to attain a mean depth of 750
to 1,000 fathoms, and that with a view of managing my machines.
Also, when I have a mind to visit the depths of the ocean five or six mlles
below the surface, I make use of slower but not less infallible means."

"What are they, Captain?"

"That involves my telling you how the Nautilus is worked."

"I am impatient to learn."

"To steer this boat to starboard or port, to turn, in a word,
following a horizontal plan, I use an ordinary rudder fixed on the back
of the stern-post, and with one wheel and some tackle to steer by.
But I can also make the Nautilus rise and sink, and sink and rise,
by a vertical movement by means of two inclined planes fastened to its sides,

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