The $10,000 Trick

A magician was boasting one day about how long he could hold his breath underwater. His record was 6 minutes. A kid who was listening said, “That’s nothing, I can stay underwater for 10 minutes using no type of equipment or air pockets!” The magician told the kid if he could do that, he’d give him $10,000. The kid did it and won the money. Can you figure out how?