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Back to 400 Years of Subs This drawing of Halsey's boat depicts a technical Turtle clone, with an "air tube to shove up when at the surface" at the top and a "water cock" and "force pump" at the bottom. The operator has one hand on the tiller, the other on a crank used to turn the propeller and drill bit. A line attaches the 'torpedo' to the drill.  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 |