RedactedNarrative: UNIT 1 WAS DRIFTING NORTH ALONG THE BANK OF BIG BAY CREEK.  THE OPERATOR PUT THE BOAT IN REVERSE AND WATER CAME OVER THE TRANSOM.  THE BILGE COULDN'T KEEP UP WITH THE WATER COMING IN AND UNIT 1 BECAME SUBMERGED.  THE OCCUPANTS PUT ON PFD'S AND CALLED 911.  THE OCCUPANTS AND BOAT WERE TAKEN BACK TO THE MARINA.