diving techniques. what is the role of cold? why are you obsessed with the cold? the cold is that what tackles our greatest problem of modern times those are cardiovascular related diseases. you know, that condition of our blood flow, which is 125,000 kilometres, millions of little muscles, you go into the cold, you train all these little muscles, and then the blood flow goes a lot better. stress of the heart goes a lot down, energy goes up. stress down, energy up. that s the cold. some people would say those achievements are insane. you know, you re a mad man wanting to run around in the ice like this and hold your breath for ridiculously long periods of time? yeah. i am a mad man in that sense. like, i m crazy about life. i m crazy about my limits, and to go past and to see that there is more than meets the eye.
on their back to get through. the option that you speak about, the drilling through the mountains to try to get down to the cave, that s finished, as is the option to leave the boys there until the end of the monsoon season. those were the three options a few days ago. they have decided to take the boys out the way they went in. but it is dangerous. dara? all eyes are now on that tunnel. thank you so much, bill, from thailand, thank you for that report. let s bring in the u.s. cave rescue mission. i know you are joining us from skype. what is your biggest concern in a rescue mission like this one? obviously, the choice of bringing them out using the diving techniques was the least safe one, but, at the time, when we thought they could be sheltered in cave for a longer period of time to give them more