Ok so somebody attacks it, with explosives. And manages to time them well enough that they go off right next to a cart, or inside one. They will get 1 passenge

Ok so somebody attacks it, with explosives. And manages to time them well enough that they go off right next to a cart, or inside one. They will get 1 passenger car. Which is what? 8 People? The tube will slowly fill with air, everybody else evacuates safely at a slower speed. I'm willing to bet on those odds. Compared to the number of car accidents, it'a a no brainer.