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Back to 400 Years of Subs Note the figure-eight cross section of this Type XXI's pressure hull. Designers initially built the lower section for storage of hydrogen peroxide for a Walter powerplant, but it became instead the compartment for the enlarged battery capacity that gave these boats the nickname "Electroboot."  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 |