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By Georgi Glover

SYDNEY, Australia (10 Network/CNN) - It started out as a trick to get a girl's attention. Now, a 32-year-old Australian is making a big splash by holding his breath for long periods of time as a free-diving champion.

Tanc Sade can hold his breath underwater for six minutes and 40 seconds.

Sade is a champion free diver, the second most dangerous sport in the world.

"It can be dangerous if it's not practiced safely. It has the second highest fatalities after base jumping," said Sade.

Instead of diving to the depths of the deep blue, Sade free dives in a swimming pool, and just like we used to do as kids, his challenge is to swim as far as he can without taking a single breath.

His best result: an Australian record - 218 meters. Those last few seconds were agony. Sade's lungs screaming for oxygen. His diaphragm contorting as carbon dioxide flooded his body.

"And that kind of gives you this really loud alarm bells saying you've gotta come up," said Sade.

As you can imagine the safety rules in this sport are very strict. Once you finish the swim you have to give the ok signal, take off your mask, then speak to the judges. If you black out before that, you'll be disqualified.

It sounds like torture, and believe it or not Sade started free diving just to impress some girls at the pub.

"One of them turned out to be a free diver so I challenged her to a breath hold at the bar," said Sade.

He didn't get the girl, but he did become an Australian champion.

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