Without having major ailments. fortunately, they're young enough for that. unfortunately, their youth basically shuts down their mental strength. so they might experience more psychological problems than adult people. >> so the limited availability of oxygen, we've been told, has been a problem in the cave. is that expected to cause any problems for them going forward, or do they recover quite quickly after they get back out into normal air levels? >> well, no, they should be recovering quite normal and very fast after recovering normal air level. the problem is you can affect the kidneys prob...