>> no, he's not. >> okay. listen to me. someone needs to start cpr. do you have anyone there who can do cpr? >> listen carefully to the dispatcher. >> you need to put him on his back. >> he's on his back. >> put the heel of your hand on his breast bone in the center of his chest. >> okay. >> notice what you don't hear. >> there was nothing in there about breaths. there was nothing about giving breaths. >> press straight down into his chest, okay? >> okay. >> go quick, okay. start counting for me. >> okay. one, two -- >> three. >> you see, it's all about compressing the chest. and until just recently that would have been unthinkable, but it does work. and here's why. for the first several minutes after your heart stops your blood still has plenty of oxygen. as expert breath holders know, it's sort of this trick that your body plays on the mind. synchronized swimmers know this. you can go without breathing far