Several years ago in a storm, a neighbor lost a motor with the boat attached ! I found it with my old HB side scan, and the whole rig was recovered from 20 fow. I remember the motor was clearly visable, so there is hope.

More recently, a friend lost 2 fiberglass keel fins from a small sailboat while towing it across the lake. I located these in 15 fow, but they were never recovered.

No weeds were involved in either location, just soft bottom.

I wish you the best of luck.