Guillaume Néry takes a moment to compose himself. He adjusts his mask, swallows a big breath of air and then dives into the sea. And he won’t come back up for several minutes. Néry is a former ...

French freediver Guillaume Nery just dropped 40 metres to the bottom of the world's deepest pool in one single breath. The diver emptied his lungs of air before beginning his descent in the Y-40 ...