It seems crazy, I can imagine the horror if the pod gets stuck between rocks while going through a narrow tunnel. The simplest solution is to give the children

It seems crazy, I can imagine the horror if the pod gets stuck between rocks while going through a narrow tunnel. The simplest solution is to give the children swimming and scuba diving lessons from inside the cave and then once a safe route has been established, the children can get to the exit one by one (accompanied by a professional diver) by swimming along a rope which leads to the exit.