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David Brushnell designed this ingenious machine in 1771. The submarine was a one manned, egg-shaped vessel which was propelled by hand-operated screw-like devices. It was bottom-heavy in order for it to remain upright. The operator would plant a submersible mine that could be triggered by a simple clockwork mechanism. He could paddle away after he attached the magazine of gunpowder onto the enemy ship. The operator could stay under for about thirty minutes
The American Turtle was ready for her initial mission on September 6, 1776, just after midnight in the New York Harbor. The operator, Ezra Lee, failed in his attempt to sink the HMS Eagle because he failed to secure the screw of the gunpowder magazine to the ship...
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