Hold Breath under water for 6 minutes puzzle

A magician was boasting one day at how long he could hold his breath under water.
His record was 6 minutes.
A kid that was listening said,
"That's nothing, I can stay under water for 10 minutes using no types 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?

Click here for Answer

The boy kept a bottle of water over his head for 10 minutes and won the money