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Hitler's Lost Sub
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Some years later, this drawing purported to be Bourne's scheme. This plan featured leather-wrapped pads that one could screw in toward the centerline to create a flooded chamber and screw out to expel the water and seal the opening. Bourne wrote of expanding and contracting structures, however, not flooding chambers, and submarines built in England in 1729 and France in 1863 conformed with his idea exactly.

Bourne's scheme

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