The tunnel took just over a year to construct and opened in March 2007.
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During boring the new tunnel passed within 3m of the operating Heathrow... -
Each end of the tunnel has 500m of ramp leading into the portals. -
Steelwork was designed to support the new ART during construction. -
The tunnel boring machine (TBM) was supplied by HerrenKnecht. -
The 1.3km-long tunnel is constructed as twin bore and cost £140m. -
The tunnel took just over a year to construct and opened in March 2007.
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