RedactedNarrative: THIS CRASH OCCURRED AS VESSEL 1 WAS DRIFTING AND OPERATOR 1 FAILED TO TAKE EVASIVE ACTION FOR PARTIALLY SUBMERGED TREES IN THE WATERWAY. VESSEL 1 BECAME PINNED AGAINST THE PARTIALLY SUBMERGED TREES AND BECAME SWAMPED ON THE STARBOARD SIDE OF THE VESSEL AT THE STERN.