RedactedNarrative: VESSEL 1 WAS HEADING SOUTHEAST INTO ELK CREEK COVE.  THE OPERATOR AND PASSENGERS STATED THE VESSEL WAS HAVING DIFFICULTY COMING UP ON PLANE.  THE PASSENGERS WERE SEATED ON A PLATFORM ON THE BOW OF THE VESSEL THE OPERATOR HAD ADDED TO USE FOR FISHING.  THE OPERATOR LET OFF THE THROTTLE AND THE BOW OF THE VESSEL WENT INTO THE WATER AND STARTED TO SWAMP THE VESSEL CAUSING IT TO SINK.  ALL PASSENGERS AND THE OPERATOR ENTERED THE WATER  AND SWAM EAST TO THE NEAREST SHORELINE.  A SECOND VESSEL CAME ALONG AND GAVE THE PASSENGERS AND OPERATOR A RIDE TO THE ELK CREEK BOAT DOCK.  PASSENGER 1 HAD A PRE-EXISTING HEART CONDITION (CARDIOMYOPOTHY) AND WAS TRANSPORTED FOR OBSERVATION FOR HIS CONDITION AND POSSIBLE HYPOTHERMIA.  AREA OF THE ACCIDENT WAS APPROX 364 FEET WEST OF THE EAST SHORE AND APPROX .14 MILES EAST OF THE WEST SHORELINE AND APPROX .19 MILES SOUTH OF THE ELK CREEK BOAT RAMP.  THE VESSEL HAD JUST BEEN PURCHASED AND ALL PAPERWORK SANK WITH VESSEL.  THE OWNER IS NOT SURE WHO THE PREVIOUS OWNER WAS AND DOES NOT HAVE A GOOD DESCRIPTION OF THE VESSEL.