Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

BLUEBELL BREAKTHROUGH

Breakthrough of the North Downs Tunnel on the Channel Tunnel Rail Link came two months ahead of schedule, marking a milestone in construction of the 3.2km tunnel over 100m below Bluebell Hill. The 13m wide, 10m high single bore tunnel is being constructed with a sprayed concrete lining similar to that used on the troubled Heathrow Express project. However this tunnel passes almost entirely through chalk rather than soft London clay. The breakthrough will see only the tunnel crown complete ...

Subscribe for full online access and get...

  • Full, instant access to all stories
  • Customised email alerts straight to your inbox
  • Monthly print magazine

Register for guest access to keep reading and get..

  • A free taste of other selected news stories
  • Daily email newsletters


Already have a subscription or ICE membership? or