According to these articles, two Airmen have been released from the hospital. Three remain hospitalized, but should recover fully.
https://www.wjhg.com/news/headlines/159033685.html
https://goo.gl/91Frz
There are 4 different types of Hypoxia. Some chemicals bond with O2 and/or prevent your body of using it. CO2 poisoning and shallow water blackout comes to mind. I think that type is called histotoxic hypoxia.
One of the things that helped me keep going through basic was the beautiful scenery. Imagine going through with the land on fire around you. Haha, talk about intimidating.