The Sea Lion was a United States submarine, yet she was not constructed along the usual naval lines. It was said of her that she looked more like a pleasure yacht built for under-surface work than anything else. It is not the purpose of the writer to enter into a minute description of the craft. She was provided with a gasoline engine and an electric motor. She was not very roomy, but her appointments were very handsome and costly.
There were machines for manufacturing pure air, as is common with all submarines of her class, and the apparatus for the production of electricity was modern and efficient. Every compartment could be closed against every other chamber in case of damage to the shell. The pumps designed to expel the water taken into the hold for the purpose of bringing the craft to the bottom were powerful, so that she seemed to sink and rise as easily as does a bird on the wing. At top speed she would make about twenty miles an hour.

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