RedactedNarrative: Both occupants of Vessel A had entered the Sebec river Canoe race.  They were in a red, 16' Old Town Charles River canoe.  They left the start in the second heat around 1000hrs.  At approximately 1025 hrs, the pair struck a rock on their port side.  
  
  This caused the canoe to take on water and swamp, as they were thrown free of the canoe.  Then canoe then broached on a rock in the middle of a set of rips.  When this happened, the bowman (Vessel owner) became trapped between the canoe and the rock, with his left ankle area becoming pinned.  
  
  Subject was pinned against the rock and in water to his chest for approximately 1.5 hrs before he was freed by rescue personnel, who had to cut the boat in half to free him.  He and Operator  A were then brought by boat to the boat landing in town Milo by Fire department watercraft, before being transported to Mayo for evaluation.  Subject was suffering from on set of hypothermia and his leg was being evaluated.  Operator A was evaluated, but in good condition.    Air temperatures where approximately 56 degrees with water temps in the mid 40's