am_Unition: At some point today, the 57.5-foot wide cutting head will gnash through the massive retaining wall on the north end of the tunnel, where a live video feed awaits to capture the moment — and perhaps the off-screen sound of engineers sighing with relief.
YO GET IN HERE, THIS THING IS DOIN' IT NOW
It's oddly satisfying to hear the crunching.
Edit: It's done now.