Operator was plowing south in Casco bay towards his house when he struck a deadhead that was submerged in the water.  Operator was doing approximately 20 to 22 MPH when he struck the object.  The impact was at the water line of the hull.  It caused a penetrating  hole in the hull at the point of impact.  The vessel started to leak water inside the vessel.  It also caused the starboard motor to vibrate as well as it bent the shaft, gauled engine coupler, and bent the rudder and prop.
Coeur d'Alene                 