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Back to 400 Years of Subs Papin tested the first boat, but his patron lost interest, and the second boat was never finished. Illustrations of this submarine look like a steam kettle (and, it so happens, Papin also invented the pressure cooker). An engraver might have confused the two, or the engravings may have been a joke or Papin's attempt at secrecy.  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 |