dr. daria long gillespie. daria, can you explain to us what kind of medical concerns you would have for these boys after being in this cave for 15 days in those conditions? >> yes, absolutely, and i know we are all waiting with baited breath to hear what happens with these boys. one of the main concerns is oxygen right now. they've been in an area where oxygen levels are low. when you're in a diving situation, oxygen is something you worry about. that's something they'll be checking out, checking their oxygen levels, checking their breathing. we're also worried about dehydration and mal nnourishmen so they'll be checking that as well. >> there is also psychological concerns. how do you convince an 11-year-old boy, we're going to do this. we have five hours together and we're going to get you out of this cave. >> just as far as the physical concerns we're worried about. i scuba dive. i'm scared to go through a small little tunnel let alone diving for five hours. it's scary to experience with these divers. all t