The things we do!

There is very little labour spent in attaining
the lower regions of the ocean, for all bodies have a tendency to sink.
When I wanted to find out the necessary increase of weight required
to sink the Nautilus, I had only to calculate the reduction of volume
that sea-water acquires according to the depth."
"That is evident."
"Now, if water is not absolutely incompressible, it is at least capable
of very slight compression. 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.


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