cannot swim, keeping in mind that they have not been able to really eat a decent meal in several days now. talk to us about the risks and the dangers. >> i mean, well, you've got -- first off, you've got a team there that's been collected together probably amongst best cave divers in the world. sth they're used to dealing in these circumstances so personally they are taking risk, because all cave diving sis a risk. it anything happens while you're in the flooded passage, you can only reach the free surface by returning back down that passage where in open diving you can drop your weight belt and surface. yes, they've got all those dangers, but they are used to dealing with those. the boys, it's a tricky ask of the boys for them to go through