HS2 Chiltern tunnel with crosspassageway visible to the right November 2022 50591

London, United Kingdom.

HS2 media https://mediacentre.hs2.org.uk/news/breakthrough-for-hs2s-longest-tunnel

https://mediacentre.hs2.org.uk/resources/f/construction/chiltern-tunnels/images-tunnelling-and-the-south-portal-compound