60 Minutes rewind. Ever tried to hold your breath for as long as you can. Most of us have.Well, this is a story about people who hold their breath for a really long time and dive down to depths never even approached before. The sport is called free diving, and it involves going down hundreds of feet into cold and dark waters on one single breath. It's considered an extreme sport because it's very dangerous.It's an experimental sport because it's revealing human capabilities which had never even been imagine ...