Jisho

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タートル潜水艇
Wikipedia definition
1. Turtle (submersible)​The Turtle (also called the American Turtle) was the world's first submersible with a documented record of use in combat. It was built in Old Saybrook, Connecticut in 1775 by American Patriot David Bushnell as a means of attaching explosive charges to ships in a harbor. Bushnell designed it for use against British Royal Navy vessels occupying North American harbors during the American Revolutionary War.
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