I think the rescue sub idea is worth evaluating by studying the channel it would have to navigate to rescue the boys. It would have to be large enough at all po

I think the rescue sub idea is worth evaluating by studying the channel it would have to navigate to rescue the boys. It would have to be large enough at all points - larger is better, and it would need paths that this ~~9 foot?? long tube can go all the way through without the walls/floor/ceiling getting in the way. This is a rigid tube!! It is possible the locals knew very well there was no clear path.