Is there something about the ventilators being for the children because born & raised in a tunnel you need a ventilator when your out? You guys know anything concerning that? The only thing I can think of is like the pressure is different down there, like scuba people can get the bends? I am wondering because I someone had said “the ventilators are are for the children” but wondering why. People who built the Brooklyn bridge deep underwater had problems due to pressure too. Or possibly not just a tunnel but really deep dumbs miles down?