OC drawing of a German City Gate from 1594. Research and concept made by me.
![](https://media.kbin.social/media/cache/resolve/entry_thumb/b9/91/b991e7e46fbb05358e20a5794ad9939cc6e21b440f25253cdbd873e1cb046d0b.jpg)
Turtle (also called American Turtle) was the world’s first submersible vessel with a documented record of use in combat. It was built in 1775 by American David Bushnell as a means of attaching explosive charges to ships in a harbor, for use against the Royal Navy during the American Revolutionary War.