> Maybe you can repressurize the tubes ... assuming there is power to do so Fail-open air valves are a thing. > to evacuate people Emergency exits are a thin

> Maybe you can repressurize the tubes ... assuming there is power to do so Fail-open air valves are a thing. > to evacuate people Emergency exits are a thing. > If a window breaks Why would a shuttle in an underground vacuum tube have windows? > The main problem and you can't engineer around it Pretty sure people said the same thing about most of the modes of transportation I mentioned above.