> Much easier to control a panicking child in a tube where he can't get at your hoses or slam his head into a rock. Also much easier to get said child into a s

> Much easier to control a panicking child in a tube where he can't get at your hoses or slam his head into a rock. Also much easier to get said child into a state of panic by sticking them in a claustrophobia-inducing tube. Also, whatever manoeuvrability characteristics the sub might have had, it was still a rigid tube bigger than the child inside. They were navigating caves, where some of the tunnels were hard to navigate by a single (flexible) adult. I _really_ wouldn't want to even chance getting the sub stuck on a tunnel.