The subjects operator, and occupant left Belle Pass Heading Southwest toward So Timbalier 54 platform when they noticed a crew boat off in the distance. Between 9 and 10 am, a wave from the crew boat came over the rear of their vessel, LA4878FD. Operator’s engine then cut off.  At this time, the vessel began to roll over due to the amount of water inside.  Another vessel saw what had happended and rescued both Operator and occupant.  Operator’s vessel then sank to the bottom of the Gulf of Mexico and was not  recovered.  Operator did not get GPS coordinates of the accident. Both subjects were wearing CG approved type 111 PFS's.  Alcohol or drugs were not a factor.  The investigating agent attempted to get information on the rescue vesse, however, Operator did not provide the agent with numbers, names, color of vessel, or type of vessel.  The agent had no information to use in order to track down the rescue vessel.
Port Fourchon                 