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Back to 400 Years of Subs 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.  Back to 400 Years of Subs Tour U-869 | Sole Survivor | Hazards of Diving Deep 400 Years of Subs | Map of Lost U-Boats | Fire a Torpedo Resources | Transcript | Site Map | Hitler's Lost Sub Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |