Thanks Darksheare. I didn't realize Clive Cussler was so involved in these projects.
You should see him in his pic on his website.
He looks like one of those guys who'd be dreaming up dredging for the predecessors to the Hunley. (Pioneer and one other.)
And yes.. he did dream up of ways of trying to find those subs.
So far, no luck yet.
This is their history at the moment.
http://www.numa.net/history/numa_history.htm