That and most models of the hyperloop require complete depressurization before people can get in or out of the capsul/car that they transport you in. I also have problems with some specific designs like one design was to have the pressure inside the tube down to near 0 atm but its mode of propulsion was to use a giant fan basically to use the remaining air pressure... Like it just wouldn't work, the fan would provide no force with nothing (to almost nothing) to push off of.