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Hitler's Lost Sub
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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.

Halsey's boat

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