Quality issues have been identified on the already constructed first 100 meters of the total 2.5km long “green tunnel” in Northamptonshire being built by contractor EKFB (Eiffage Kier Ferrovial Bam JV). Assurance tests are being done on the installed pre-cast sections.

https://www.newcivilengineer.com/latest/quality-issues-detected-in-hs2s-pre-cast-green-tunnel-at-chipping-warden-18-08-2022/