RedactedNarrative: Vessel was preparing to enter the Holland Channel. Operator/Owner stated that he was aware of the dredging that was going on at the entrance of the channel. He states he thought he was clear of the dredging pipes. He then placed his vessel in auto-pilot while he took down his sails. 
  
  He stated that he looked over his shoulder at the last second and saw one more buoy to the left of his vessel, tried to take evasive action without success. The dredging pipe struck his keel, which caused the pipe to slide along the bottom of his hull. The dredging pipe then struck his rudder causing the rudder to break free from the hull and allowing water in to the vessel.