This submarine was built by the Confederacy during the Civil War when the technology for submarines was first being developed. The boat was never documented as being built, and was rediscovered in 1878 when Bayou St. John was dredged. At first it was assumed to be the Pioneer, but research has revealed that the Pioneer was a different submarine design. So, a lot of mystery still surrounds this boat, but you can explore it yourself at the Louisiana State Museum in Baton Rouge.