The website, riverbender.com is the only news outlet that I can find with anything about the sub.
This link is to an article about another submarine found in an Illinois river (in 1915):
https://www.historynaked.com/fool-killer-submarine-chicago-river/
"The “Foolkiller” was so called because it first made its appearance shortly after the Chicago fire, in the days when submarines were unheard of"
An article today - April Fool's Day - about a submarine found in an Illinois river, which happens to sound similar to another submarine - named Foolkiller - found in an Illinois river.
In Illinois when I was a kid, teenage boys would get girls to make out with them by driving them down to the levee “to watch the submarine races.”