Fernandina Beach Fire Rescue Chief Ty Silcox said the missing teen was with two others in a blow-up raft when they "lost control" and the teen went under the water.
A swimmer went missing Wednesday afternoon and two more swimmers were taken to a local hospital after they were pulled from the waters off a Nassau County beach.
Fernandina Beach Fire Department and Nassau County Fire Rescue responded to cargo ship fire that started in a cargo hold loaded with plywood, said Ty Silcox.