I have to wonder how effective he will be at advancing tunnel boring using existing technology. From the article, it sounds like he has no figures of the cost

I have to wonder how effective he will be at advancing tunnel boring using existing technology. From the article, it sounds like he has no figures of the cost breakdown on a standard tunnel boring project such as the fixed costs like moving and assembling the machine, or the variable costs like how much is spent on materials, labor, etc. Given that, I'm skeptical that he can bring down the cost of tunneling since this approach seems to eschew a first principals based approach to the problem. I'm guessing that he really just wants to be able to build a federally subsidized tunnel from LAX to the SpaceX office so he doesn't have to sit in traffic.