>American city tries to build underground highway, rail line, or new subway (Big Dig, Alaskan Way Viaduct, East Side Access, 2nd Avenue Subway, etc.)
>costs tens of billions of dollars and gets mired in years of delays

why the fuck does this keep happening? TBMs are practically a cheat code for digging tunnels

the last two are particularly embarrassing because a lot of the hard work was done decades ago without TBMs and it was just the job of the MTA to fill in the gaps