RedactedNarrative: VESSEL ONE WAS DEPARTING THE DOCKS AT SITE 6 IN REVERSE WHEN IT COLLIDED WITH THE PORT STERN OF VESSEL TWO WHICH WAS TRAVELING TOWARDS THE LAUNCH RAMP.  VESSEL ONE SUSTAINED MINOR DAMAGE TO THE SWIM STEP ON THE PORT SIDE.  VESSEL TWO SUSTAINED SIGNIFICANT FIBERGLASS DAMAGE TO THE PORT SIDE AT THE STERN.  THE COLLISION WAS OBSERVED BY OFFICERS.  THE OPERATOR OF VESSEL ONE ADVISED THAT HE DID NOT SEE VESSEL TWO WHEN BACKING AT A WAKELESS SPEED.  VESSEL TWO WAS TRAVELING TOWARDS THE RAMP AT A WAKELESS SPEED.