Yeah looks quiet.. no cavitation..
At my first view, I thought those large finds were part of a prop system. I may have been way off base. Others are saying they think their more likely rudders or dive planes.
I could have been way off.
I do see something just forward of those (what I thought) were props. I thought those were the rudder and dive planes.
At any rather, that’s an interesting look.
You mentioned cavitation. I also thought a large prop system like that could move much slower and perhaps cause less churning, a quieter wake.