Years ago, when I was a mere child, we had a horrific drowning here at a Marina my father worked at. Guy was drunk and in the middle of the night, fell between the boat and the dock and landed waist deep in the thick mud that covers the bottom of the back bays here in NJ. To judge by the marks on his boat.. as the tide came up, he was scratching and clawing for he was worth to get aboard.
Sadly they found him in the next day when the tide went back down.
We can only guess that a full keel boat may have prevented that death as it would need more depth at it's slip.
But back to the Original Topic. a spinning prop is a magnet for lines
.. you could have it totally shrouded and it would still find a way to suck a line
in and wrap it tight.