While tied to a houseboat that was being pushed, operator, noticed that the vessel was taking on water.  subjects entered the vessel that was taking on water started the engine, and began trying to get on step in an attempt to travel closer to the shore.  As the vessel began taking on more water, occupant jumped out of the vessel into the water. Operator remained with the vessel as it sank at which time an individual upon houseboat, entered his vessel and grabbed Occupant placing him back upon the houseboat.  EMS services responded to the landing where houseboat individual had transported Occupant, and Operator into shore.  EMS then transported Occupant to Teche Regional Medical Center where he was later released.  agents conducted SFST's  upon the subject.  St. Mary Sheriff Deputy transported Operator to Berwick Police Department where  Operator was read his rights related to chemical test.  Operator did submit a proper breath sample which shown his B.AC. to 09g%.. Operator was then booked into jail.  Both subjects were wearing PFD's at the time of incident.  Vessel was equipped with hand tiller outboard.     
During investigation agents were unable to determine the reason the vessel began taking on water.  The subjects on board the vessel, and houseboat , state that they just happened to look up and see water in the vessel. Agents believe that the plug may have been removed from the vessel.
Berwick