Oops, I should have been more explicit. I meant operated remotely, like by its cord. A fish camera. Hence: real time monitoring, capable in a current (> 5 knots), good set of lights.
While I may end up diving in the Wisconsin River if I find something valuable, it's no place to spend much dive time. It's dark water, and dangerous. I'm the only one I know who's been dumb enough to have done it. In the past. The idea is to avoid scuba and view the bottom remotely.