According to statement of operator.  Subjects were wake boarding in Pascagoula River.  Victim1 and Victim2 were in the water with PFD's on, all were drifting.  Victim1 was trying to instruct Victim2 how to get up on the board when he noticed they had drifted close to some moored barges located in the river.  Operator advised he repositioned the vessel to avoid colliding with the barges and turn around to pick up Victim1 and Victim2, he looked back and could not see Victim1 and Victim2 anymore.  He Circled around a couple of times and realized something was wrong and went for help. 
Victim1 was recovered that afternoon.  Victim2 was recovered next day. River current was very strong from previous rains and both victims had PFD on when recovered. 
Both causes of death was drowning.  Believed current took subjects under barge.
Pascagoula