Literally the same machine that they used to dig the sewer below Los Reyes, is the pre-owned tunneling machine that the Boring company bought. 🤣
There is no significant technical innovation in their tunnel digging. There is no theory of change. It's just a dude that doesn't understand civil engineering, and doesn't understand why tunnels are expensive, thinking that you don't need things like service tunnels and fire systems and ventilation and water pumps.