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Significant HS2 milestone as Chiltern Tunnel complete - Sir Robert McAlpine

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Read more Meet the Team Search & Apply What's on Latest news Events Capital Ventures Display Search 7th Aug 2025 Significant HS2 milestone as Chiltern Tunnel complete

The construction of the 10-mile tunnel by our Align JV finishes ahead of schedule

Sir Robert McAlpine News and Comment Significant HS2 milestone as Chiltern Tunnel complete Our Align JV are celebrating following the completion of construction for the highly complex Chiltern Tunnel. The five-year programme involved construction of the 10-mile tunnel, the longest on the HS2 route, the South Portal porous portal structures and accompanying earthworks trace. 

Align is our HS2 joint venture with Bouygues Travaux Publics and VolkerFitzpatrick.

Works began in 2020 with the iconic tunnel boring machines (TBMs), Florence and Cecilia, commencing their journeys in spring 2021. Their typical drive is 5-6km, so this circa 16km drive required some technical innovations never used before in the UK.

Since the breakthroughs of the TBMs at the North Portal in early 2024, the team have been finishing the 38 cross passages and 5 adits, the strip out of services and slurry pipes, slipforming the emergency walkways, completing construction of the South Porous Portals and constructing the crossover slabs and drainage for the train track. 

The portals are built to eliminate the possibility of ‘sonic boom’ being created by high-speed trains entering at 200mph, a first for the UK rail network.

Through the project's close teamwork and collaboration, the programme was completed 12 days ahead of the contractual date.

An incredibly complex project, it has won multiple awards and showcased some pioneering engineering expertise. 

Find out more about HS2 HS2 completes civil engineering works on longest tunnel 23 Jan 2026 The close of work on the tunnel's vent shafts brings an end to a project our Align JV began almost five years ago

Read more about Colne Valley Viaduct scoops two NCE Bridges awards 05 Aug 2025 Iconic structure forms part of the HS2 project being constructed by our Align JV

Read more about Unique HS2 tunnel portal completed 25 Apr 2025 Our Align JV builds tunnel extensions for HS2 to stop sonic booms from 200mph trains entering the 10-mile Chiltern Tunnel.

Read more about Latest news SRM supports Design Engineer Construct! at Agratas 24 Feb 2026 Severfield, steelworks contractor on Agratas' project, has adopted a local school to deliver an award-winning industry learning programme

Read more about Final phase of Hexham hospital redevelopment completed 18 Feb 2026 Phase 3 delivered state-of-the-art operating theatres, modernising surgical facilities to support high-quality, modern care

Read more about NAW: Apprentices at Agratas 13 Feb 2026 Administration Apprentice, Maisie Woods, a resident of Bridgwater, is amongst the ten apprentices employed by Sir Robert McAlpine currently working at Agratas

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