Looks like a Ginsu Propeller™. Slices, dices, etc...

In all seriousness, it would be great if it worked out, but we are constantly seeing marine tech being messed up by the marine environment.

There's a reason that every damn thing that has "Marine" in its title, costs ten times as much.

It really, really sucks to be stuck out in the middle of the ocean, because your shaft rusted.