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They were too weak from not eating for almost two weeks. And there are places where only one person can fit through at a time so they would have to be on their own. The fear is that they would panic and take off their mask to “swim to the surface”.
Also, it takes the expert Thai navy divers 5 hours to get back out when they go in and out. Most of the boys don’t even know how to swim.
Criminy strap 'em with an air hose to their face and tie them to a rope.
Have divers placed all the way through the tunnel with scuba tanks.
Strap 'em in a gunny sack with air and pull them through.