 They get the oxygen to leave the hemoglobin. Now, the hemoglobin is still all oxygenated. It goes from the lung with oxygen on it out to your toe and then comes back and it's still got the oxygen on it. It did nothing. It literally carried no oxygen to any place you need because your carbon dioxide levels are so low. So what you do with these people is you get the carbon dioxide levels up. Yeah. How do you do that?