RedactedNarrative: UNIT 1 WAS TRAVELING SOUTH IN THE ICW AT APPROXIMATELY 8-10 KNOTS WHEN IT STRUCK A SUBMERGED OBJECT.  THE OPERATOR WENT TO THE ENGINE ROOM AND FOUND A PIECE OF METAL HAD BREACHED THE HULL BETWEEN THE ENGINES.  UNIT 1 TOOK ON WATER AND SUNK AT THE LOCATION.