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Back to 400 Years of Subs The Turtle as drawn in 1875. Despite an effort to gather reliable information, the artist made several significant errors. The drawing shows ballast tanks, though the Turtle had none. It depicts an Archimedes screw (helical) for locomotion instead of a propeller like the "arms of a windmill" or a "pair of oars" described by Bushnell and others. Finally—and this we may forgive—it displays the operator wearing a rather foppish late-19th-century outfit.  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 |