RedactedNarrative: Operator was operating his vessel in the St. Martins river when he ran over a crab trap, entangling the rope around the lower unit. Operator raised the motor and stepped onto the pontoon/step on the stern of the vessel in an attempt to untangle the motor. He was wearing clog type shoes and when he stepped onto the wet pontoon he lost his footing and his right leg went down the rear of the pontoon. As he fell the drain plug on the rear of the pontoon was oriented with the tightening handle facing up. As his leg racked down the back of the pontoon the handle of the plug cut him from just above his ankle and spiraled to above his knee. ;Subject had a one inch wide laceration on his right leg starting at his ankle and going upward in a spiral motion to approximately two inches above his knee