Thanks for the correction. I know there have been tunnels where TBMs were left b... | Hacker News

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nradov on Feb 17, 2017 | parent | context | favorite | on: Elon Musk is boring a tunnel to skirt gridlock

Thanks for the correction. I know there have been tunnels where TBMs were left behind but apparently that's less common than retrieval.

http://www.nysun.com/new-york/after-work-done-drills-likely-...

http://www.madehow.com/Volume-6/Tunnel.html

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