RedactedNarrative: DRAGON BOATS WERE PRACTICING MANEUVERS IN THE ICW JUST SOUTH OF THE SWING BRIDGE.  UNIT 1 WAS HEADING NORTH WHEN UNIT 2 TURNED IN CLOSE PROXIMITY TO UNIT 1.  UNIT 1 TURNED STARBOARD TO AVOID COLLISION AND RAN AGROUND.  BOTH PROPELLERS WERE BENT.