You probably heard that the state revised its plans for the Peripheral Tunnel. It has reduced its build-O-rama impacts to the community of Hood, moved to the east a forebay that would have submerged the community, shrunk said forebay, shortened the tunnel, widened it, and other significant changes.
It’s wonky stuff, but if you interested click here.
Here’s an a L.A. Times story about the sort of monstrous tunnel-boring machine tunnel-builders will use.
This one, called Bertha, is currently digging a highway beneath Seattle.