French Submarine Plongeur
Plongeur (French for "Diver") was a French submarine launched on 16 April 1863. She was the first submarine in the world to be propelled by mechanical (rather than human) power.
Captain Siméon Bourgeois, who made the plans, and naval constructor Charles Brun began working on the design in 1859 at Rochefort.
Read more about French Submarine Plongeur: Specifications, Operational History, Conversion
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“Sanity is the lot of those who are most obtuse, for lucidity destroys one’s equilibrium: it is unhealthy to honestly endure the labors of the mind which incessantly contradict what they have just established.”
—Georges, French novelist, critic. L’Abbé C, pt. 2, ch. 17 (1950)