RedactedNarrative: RECEIVED NOTIFICATION OF A POSSIBLE BOATING ACCIDENT AT 01:00 BUT THE LOCATION WAS UNKNOWN.  AT 06:00 2 VESSELS (V1 AND V2) WERE LOCATED GROUNDED ON THE SHORELINE NORTH OF SHILOH MARINA.  V1 AND V2 OPERATORS STATED THE OCCUPANT OF V1 HAD GOTTEN ANGRY AND DECIDED TO TRY TO SWIM TO THE MARINA.  THE OCCUPANT WAS FINALLY LOCATED SEVERAL HOURS LATER SAFE.  ALL THREE ADMITTED TO CONSUMING ALCOHOL AND DECIDED TO GO FOR A BOAT RIDE SOMETIME AROUND MIDNIGHT. NONE OF THEM WERE FAMILIAR WITH THE LAKE.  V1 AND V2 WERE TRAVELING SINGLE FILE RUNNING APPROX. 45 MPH WHEN V1 RAN AGROUND AND CAME TO REST APPROX. 120 FEET ONTO THE SHORELINE. V2 OPERATOR STATED HE WAS FOLLOWING V1 BUT REDUCED SPEED WHEN V1 IMPACTED THE SHORE; HOWEVER HE WAS FOLLOWING CLOSELY SO HE ALSO RAN AGROUND BUT CAME TO REST ONLY A FEW FEET UP ON SHORE.