The things we do!

"
"Are these lenses capable of resisting such pressure?"
"Perfectly. Glass, which breaks at a blow, is, nevertheless, capable of
offering considerable resistance. During some experiments of fishing
by electric light in 1864 in the Northern Seas, we saw plates less
than a third of an inch thick resist a pressure of sixteen atmospheres.
Now, the glass that I use is not less than thirty times thicker."
"Granted. But, after all, in order to see, the light must exceed
the darkness, and in the midst of the darkness in the water,
how can you see?"
"Behind the steersman's cage is placed a powerful electric reflector,
the rays from which light up the sea for half a mile in front."
"Ah! bravo, bravo, Captain! Now I can account for this
phosphorescence in the supposed narwhal that puzzled us so.
I now ask you if the boarding of the Nautilus and of the Scotia,
that has made such a noise, has been the result of a chance rencontre?"
"Quite accidental, sir. I was sailing only one fathom
below the surface of the water when the shock came.


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