rescued. but as this one case with a thai navy s.e.a.l. showed, diving is very dangerous. it can be anything from lack of oxygen to embolus, something blocking their bloodstream, all of these things can cause death in diving. and especially when you have a long five-hour dive, that's going to be something everyone is concerned about. >> some of the letters that went from the kids to their parents, it sort of struck me -- it reestablished how young they were, talking about things like what they wanted to eat when they left. is it possible that due to their age that this wasn't something that they really recognized, just the gravity of their situation? >> i've said before that in many ways their younger age is somewhat of a blessing. because not only are they, as you mentioned, mentally they probably don't understand, they likely don't understand the degree of risk undertaken. i'm sure they haven't been told about the thai navy s.e.a.l. and