I have a 2011 Hunter 45DS. We are in fresh water. We are getting a rust spot high on the back edge of the keel. I was going to grind it down and seal and fill it. Then I started to wonder if this rusty spot was once a drain hole. Does anyone know if Hunter put bilge drain holes in their keel on their larger boats. There are voids in the bilge that can not be drained from inside the boat.