RedactedNarrative: V1 was drifting & victim was scrubbing the back deck of the boat with a sponge when the sponge was dropped into the lake.  Victim went to reach for the sponge lost his balance & fell.  The fall impaled the upper part of his left leg with the right rear boat cleat and left him dangling over the side. V1 operator was able to hold his head out of the water until help arrived.  Neither one was wearing a life jacket.