The Boring Company will extend its tunneling project into the west side of Los Angeles. They want to tunnel 10 times faster and cheaper than traditional tunneling. Part of the gain is from having narrower tunnels compared to regular subways. Reducing the tunnel diameter by 50% will also reduce the cross-sectional area of the tunnel by a factor of four.
The first tunnel is almost done
— Elon Musk (@elonmusk) October 22, 2018