Fred is sucked into an underground current.
From Create Your Own Story
Just as soon as Fred drops below the water level, he's sucked into an underground current. Fred has no control as he's pulled with the flow of the water. Precious time ticks away, as our hero can't breathe under water.
Just as all hope seems lost... That point beyond which no one could have survived, Fred is thrown from the water and lands on a sandy beach. Fred passes out.