I notice in The Times this morning a small feature on free diving. people who see how far down they can go in the water and get to the surface again without any form of breathing apparatus. The world record depth currently stands at a staggering 281metres.
What did strike me in the article was the statement that, apparently these feats are made possible by a special breathing technique, called "apnoea". Wow! who'd have thought it. Doesn't that just mean holding your breath?