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USA 2012.

Alaskan Way Tunnel Sr99. Seattle (USA)


HNTB Corporation.


Tender Project in Offer and Collaboration in the drafting of the Detail Project..


  • Procurement in the tendering phase.

  • Collaboration with the main engineering in the drafting of the detail project.

  • Length: 1755.9 mi in TBM and 0.39 yd in fake tunnel.

  • Øint ≈ 17.3 yd, Excavated in geotechnically difficult terrain.

  • Øexcav = 19.17 yd (world record).

  • Initial well and tunnel boring machine exit.

  • Urban tunnel excavated under the city's most important buildings.

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