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Lead ballast kept the craft upright and it was propelled by hand-operated screw-like devices. The submarine was submerged when a valve admitted sea-water into a ballast tank, and rose when the tank was emptied by a hand pump. The armament of the ship included a single gunpowder bomb with a time-fuse. One of the key setbacks to this innovation to warfare was it's lack of an onboard oxygen supply. Lacking this, "Bushnell's Turtle" could only remain submerged for a half hour.
The reason that this type of machine was developed was because Americans were looking for a way to ambush English ships.
Unfortunately though, Bushnell's Turtle was a failure in it's own right...
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