Nova is showing a one hour program called "Super Tunnel" about the Crossrail line being constructed under London. Tomorrow night (Wednesday) 9:00PM EDT on PBS.
http://www.pbs.org/wgbh/nova/tech/super-tunnel.html
And now, after five more years, Crossrail (rebranded as the Elizabeth Line) is open for business: https://www.youtube.com/watch?v=pIEKF5kqJn4
although not everything went smoothly: https://www.youtube.com/watch?v=2Glv7FVZ7gQ
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