RedactedNarrative: OPERATOR OF VESSEL STATED HE DID NOT SEE A NAVIGATIONAL MARKER BUOY AND HAD AN IMPACT WITH WHAT HE BELIEVED TO BE A ROCK.  NO INJURIES WERE REPORTED. AFTER A FEW MINUTES OF HITTING THE OJECT IN THE WATER THE MOTOR CUT OUT AND THE BOAT BEGAN TO FILL WITH WATER UNIT IT SANK.