RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHEN THEY PULLED VESSEL 1 INTO A DOCK SLIP AND STOPPED. WHEN OPERATOR 1 SHUT THE MOTORS DOWN ONE OF THE PASSENGERS BEGAN TO CLIMB DOWN THE LADDER AT THE STERN OF VESSEL 1. PASSENGER #3 ON THE VESSEL MISSED A STEP ON THE LADDER WHILE DISEMBARKING AND STRUCK THE STARBOARD TRIM TAB. THIS IMPACT WITH THE STARBOARD TRIM TAB CAUSED INJURIES TO PASSENGER #3. THERE WAS NO OTHER INJURIES AND NO DAMAGE TO VESSEL 1.