very dangerous dives. what's that got to be like for a child, especially some children who cannot swim who are in this situation? what's that like for them? >> well, they'll have a range of reactions. and i think the important potentially helpful way of viewing this is to see it as some sort of adventure for a child rather than focusing on the potential danger and potentially what could go wrong in those dangerous situations. i think the scariest parts for the kids will be those very, very, very narrow parts of the cave where there's potential for getting trapped. that will be quite frightening and that's something they won't have had any experience really of dealing with before. but they've got so much support around them and two divers per child. and as long as they can trust those divers and follow those instructions, it is a very long journey out of the cave, they