RedactedNarrative: V1 WAS TRAVELING NORTH ON SAYLORVILLE LAKE ABOUT 35 MPH WHEN THE NOTICED A SUBMERGED LOG IN THE WATER. V1 SWERVED BUT HIT THE LOG ON THE STARBOARD SIDE CAUSING THE TOP OF THE VESSEL TO SPLIT ALONG THE SEAM FROM THE HULL. THE BOAT STARTED TAKING ON WATER & WAS TOWED TO THE NEAREST BOAT RAMP.  INVESTIGATING OFFICER THEN TOOK THE OPERATOR TO RETRIEVE THE VEHICLE & TRAILER AT A DIFFERENT RAMP.  UPON RETURNING TO THE VESSEL, IT HAD SUNK AT THE RAMP.