I’m disappointed that this article doesn’t have more answers as to why and when this sub was designed, but its guesses that it was an answer to the blockade of New Orleans’ port certainly fits. Strange that there’s no accompanying history to the Hunley and the David, both of which were well-known and documented.
Imagine this. It’s Bayou Boogaloo and you’re on the raft you built with your buddies. You plunge your oar into the waters of Bayou St. John and feel it scrape something hard.
What could it be? A hunk of concrete? A stolen car? Or … a submarine?
If you found a sub in these waters, it’d definitely be a story, but it wouldn’t be the first time. Because that distinction goes to a mysterious vessel discovered here way back in the spring of 1878./blockquote>
Source: Today a picturesque waterway, Bayou St. John once harbored a Civil War submarine | Entertainment/Life | theadvocate.com