[matell]

I like the engineering side of the problem. if I understand it properly, the greatest danger is that even when two professional divers will accompany each boy through the passage, if that child panicks in a narrow underwater section, there is risk both three may get drown. I imagine that they can try to infuse each child with some calm-down preparate to prevent panick, in such a manner that child will be still able to use his own muscles to walk.