RedactedNarrative: AT THE TIME OF THE ACCIDENT THE CONDITIONS WERE VERY DARK WITH LITTLE OR NO MOONLIGHT. THE NIGHT LIGHT AT THE BOAT RAMP WHICH IS A MAJOR REFERENCE POINT FOR NIGHTIME OPERATION WAS NOT WORKING. THE OPERATOR WAS AWARE OF A SEMI-SUBMERGED TREE IN THE CHANNEL BETWEEN HIS LOCATION AND THE BOAT RAMP.  AS THEY RETURNED TO THE BOAT RAMP, HE TRAVELED SOUTH IN ORDER TO GET FAR ENOUGH TO THE RIGHT TO AVOID THE TREE AND WHEN HE FELT HE CLEARED THE TREE HE TURNED BACK LEFT AND RAN AGROUND ON THE SHORE. V1 IMPACTED THE SHORE AT A 45 DEGREE ANGLE AND TRAVELED APPROX. 75 FEET ON SHORE BEFORE OVERTURNING AND EJECTING ALL OCCUPANTS.