RedactedNarrative: Subject was occupant of the vessel that was looking to dock.  He was seated in the port bow area on or near a cooler that was on the seat, with an approximately same height of the gunwale.  The other occupants and operator were looking toward the dock when they heard a splash.  It is unclear whether the subject fell overboard or entered the water on his own will.  The occupants saw him on the surface for a minute then saw him submerge. The subject was not seen again until located by public safety divers.