Hold your breath and dive deep into the sea with world record freedivers Yasemin Dalkilic, David Lee and freediving trainer Rudi Castineyra as they explore how deep the human body can go on one breath of air.

The ocean pressure crushes their bodies, vital functions shut down, and oxygen depravation sets in. But it's during the ascent through the Blackout Zone, that makes freediving one of the most dangerous sports.

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