Detailed text transcripts for TV channel - CNN - 20180705:21:53:00
Equipment, if anything at all happens and you can cannot correct that within a minute or so, you're dead. >> reporter: some of the boys can't swim. all of them have been zapped of strength and need to be given more food to build energy. then there are the psychological challenges. >> there are going to be emotionally tense moments. they have to be ready for them. >> reporter: this psychologist says the boys, already traumatized from being trapped, have to battle other elements to scuba dive. >> that feeling of claustrophobia, it is treacherous. the fear that someone will panic is absolutely le...