HS2 C1 – Florence Breaks Through

Tunnel Boring Machine (TBM) Florence has successfully completed excavation of the first of two 16 km long bored tunnels through the chalk of the Chiltern Hills. TBM Cecilia is not far behind, having completed 15.865 km, or 98%, of the second tunnel with boring expected to be completed by the end of March 2024.

Gall Zeidler Consultants (GZ), as part of the Align JV team, provided the design for all cross passages, the ground treatment design, and are serving as a geotechnical specialist with on-site support during construction.

 A video of the breakthrough can be seen here.

If you are interested in GZ’s involvement with the project, visit our project page.

Breakthrough of TBM Florence on February 27th, 2024.