Elon isn't very clear about what he is going to use these tunnels for. I would not be surprised if he was thinking bigger than cars and put a hyperloop in it. D

Elon isn't very clear about what he is going to use these tunnels for. I would not be surprised if he was thinking bigger than cars and put a hyperloop in it. Digging the tunnels will take a lot of time so in theory he could wait for a working version of a hyperloop.